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University of Colorado
1.
Pino, Juan Manuel, II.
Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.
Degree: PhD, Physics, 2010, University of Colorado
URL: http://scholar.colorado.edu/psci_gradetds/4 
► A dilute gas Bose-Einstein condensate (BEC) near a Feshbach resonance offers a system that can be tuned from the well-understood regime of weak interactions…
(more)
▼ A dilute gas Bose-Einstein condensate (BEC) near a Feshbach resonance offers a system that can be tuned from the well-understood regime of weak interactions to the complex regime of strong interactions. Strong interactions play a central role in the phenomena of superfluidity in liquid He, and theoretical treatments for this regime have existed since the 1950’
s. However, these theories have not been experimentally tested as superfluid He offers no similar mechanism with which to tune the interactions. In dilute gas condensates near a Feshbach resonance, where interactions can be tuned, strong interactions have proven difficult to study due to the condensate’
s metastable nature with respect to the formation of weakly bound molecules. In this thesis, I introduce an experimental system and novel probes of the gas that have been specifically designed to study strongly interacting BECs. I present Bragg spectroscopy measurements that have accessed this regime, as well as proof-of-principle experiments using photon-counting for Bragg spectroscopy at low-momentum. Finally, I show preliminary data using contact spectroscopy, which is a method that could lead to the first measurements of the predicted interaction energies for a dilute Bose gas of atoms in the strongly interacting regime.
Advisors/Committee Members: Deborah S Jin, Eric A Cornell, Jun Ye.
Subjects/Keywords: BEC; Bose-Einstein Condensate; Feshbach; interacting; probe; superfluid; Physics
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APA (6th Edition):
Pino, Juan Manuel, I. (2010). Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/psci_gradetds/4
Chicago Manual of Style (16th Edition):
Pino, Juan Manuel, II. “Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.” 2010. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/psci_gradetds/4.
MLA Handbook (7th Edition):
Pino, Juan Manuel, II. “Strongly Interacting Bose-Einstein Condensates: Probes and Techniques.” 2010. Web. 15 Jun 2019.
Vancouver:
Pino, Juan Manuel I. Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/psci_gradetds/4.
Council of Science Editors:
Pino, Juan Manuel I. Strongly Interacting Bose-Einstein Condensates: Probes and Techniques. [Doctoral Dissertation]. University of Colorado; 2010. Available from: http://scholar.colorado.edu/psci_gradetds/4
University of Colorado
2.
Martin, Michael J.
Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock.
Degree: PhD, Physics, 2013, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/78
► Neutral atom optical standards require the highest levels of laser precision to operate near the limit set by quantum fluctuations. We develop state-of-the-art ultra-stable…
(more)
▼ Neutral atom optical standards require the highest levels of laser precision to operate near the limit set by quantum fluctuations. We develop state-of-the-art ultra-stable laser systems to achieve a factor of 10 enhancement in clock measurement precision and additionally demonstrate optical linewidths below 50 mHz. The most stable of these lasers reaches its thermal noise floor of 1 × 10-16 fractional frequency instability, allowing the attainment of near quantum-noise-limited clock operation with single-clock instabilities of 3×10-16 at 1
s. We utilize this high level of spectral resolution to operate a 87Sr optical lattice clock in a regime in which quantum collisions play a dominant role in the dynamics, enabling the study of quantum many-body physics. With a fractional level of precision of near 1 × 10-16 at 1
s, we clearly resolve the signatures of many-body interactions. We find that the complicated interplay between the p wave-dominated elastic and inelastic interaction processes between lattice-trapped atoms leads to severe lineshape distortion, shifts, and loss of Ramsey fringe contrast. We additionally explore the theoretical prediction that these many-body interactions will modify the quantum fluctuations of the system and we find that in certain parameter regimes the quantum noise distribution exhibits a quadrature dependence. We further present technological advancements that will permit ultra-stable lasers to operate with reduced thermal noise, leading to a potential gain of an additional factor of 10 in stability. This indicates that laser fractional frequency instabilities of 1 × 10-17 are within experimental reach, as is a fully-quantum-limited regime of optical clock operation.
Advisors/Committee Members: Jun Ye, Ana Maria Rey, Eric A. Cornell, Deborah S. Jin, Kevin H. Wagner.
Subjects/Keywords: Many-body physics; Optical atomic clocks; Precision spectroscopy; Stable lasers; Atomic, Molecular and Optical Physics; Optics
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APA (6th Edition):
Martin, M. J. (2013). Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/78
Chicago Manual of Style (16th Edition):
Martin, Michael J. “Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock.” 2013. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/78.
MLA Handbook (7th Edition):
Martin, Michael J. “Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock.” 2013. Web. 15 Jun 2019.
Vancouver:
Martin MJ. Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock. [Internet] [Doctoral dissertation]. University of Colorado; 2013. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/78.
Council of Science Editors:
Martin MJ. Quantum Metrology and Many-Body Physics: Pushing the Frontier of the Optical Lattice Clock. [Doctoral Dissertation]. University of Colorado; 2013. Available from: http://scholar.colorado.edu/phys_gradetds/78
University of Colorado
3.
Neyenhuis, Brian.
Ultracold Polar KRb Molecules in Optical Lattices.
Degree: PhD, Physics, 2012, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/83
► The creation of a gas of ultracold polar molecules with a high phase space density brings new possibilities beyond experiments with ultracold atomic gases.…
(more)
▼ The creation of a gas of ultracold polar molecules with a high phase space density brings new possibilities beyond experiments with ultracold atomic gases. In particular, long-range, anisotropic, and tunable dipole-dipole interactions open the way for novel quantum gases, with applications including strongly correlated many-body systems, and ultracold chemistry. This thesis will present the final steps to complete control over both internal and external degrees of freedom of the molecule which allows us to control, and even completely suppress, the chemical reactions between molecules. First, the control over internal states has been achieved through coherent state transfer to the ro-vibronic ground state and coherent manipulations of the hyperfine and rotational states with microwave radiation. Second, external degrees of freedom are controlled by loading the gas into an optical lattice. With the molecules loaded into a one-dimensional lattice, the orientation of the molecular collisions is controlled by manipulating both internal (hyperfine states) and external (motional states in the direction of tight confinement) degrees of freedom. Most striking is that by preparing the molecules all in the lowest band of the lattice in the same internal state, the molecular collisions can only occur in a side-by-side" orientation, where the chemical reaction rate is suppressed by the repulsive dipole-dipole interactions. The chemical reaction can be suppressed completely by further constraining the motion in the trap in a strong 3D lattice. Here we see lifetimes longer than 20
s, limited by o-resonant light scattering. Finally, the ac polarizability of the molecules is explored and controlled. The different rotational states of the molecule have different polarizabilities and will experience a different trapping force in both the optical dipole trap or lattice. We show that there is a magic angle" between the quantization axis and the polarization of the trapping laser at which the polarizabilities of two different rotational states can be matched, eliminating dephasing and allowing for coherent manipulations between rotational states.
Advisors/Committee Members: Deborah S. Jin, Jun Ye, Eric A. Cornell, Ana Maria Rey, Carl Lineberger.
Subjects/Keywords: KRb; optical lattice; ultracold molecules; Physics
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APA (6th Edition):
Neyenhuis, B. (2012). Ultracold Polar KRb Molecules in Optical Lattices. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/83
Chicago Manual of Style (16th Edition):
Neyenhuis, Brian. “Ultracold Polar KRb Molecules in Optical Lattices.” 2012. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/83.
MLA Handbook (7th Edition):
Neyenhuis, Brian. “Ultracold Polar KRb Molecules in Optical Lattices.” 2012. Web. 15 Jun 2019.
Vancouver:
Neyenhuis B. Ultracold Polar KRb Molecules in Optical Lattices. [Internet] [Doctoral dissertation]. University of Colorado; 2012. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/83.
Council of Science Editors:
Neyenhuis B. Ultracold Polar KRb Molecules in Optical Lattices. [Doctoral Dissertation]. University of Colorado; 2012. Available from: http://scholar.colorado.edu/phys_gradetds/83
University of Colorado
4.
Loh, Huanqian.
Search for an electron electric dipole moment with trapped molecular ions.
Degree: PhD, Physics, 2013, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/86
► The search for a permanent electron electric dipole moment (eEDM) serves as a test of fundamental symmetry violations and of physics beyond the Standard…
(more)
▼ The search for a permanent electron electric dipole moment (eEDM) serves as a test of fundamental symmetry violations and of physics beyond the Standard Model. Trapped molecular ions in the
3Δ
1 metastable electronic state are suitable candidates for an eEDM search due to their large effective electric fields and long electron spin coherence times. This thesis presents the quantum state manipulation and coherent spectroscopy of trapped HfF+ molecular ions in rotating bias fields for an eEDM search. The quantum state manipulation, which involves preparation of a large fraction of molecular ions in a single desired quantum state as well as rotational-state-resolved detection, is complicated by the lack of HfF+ spectroscopic information prior to the start of this thesis. We performed state preparation by first state-selectively autoionizing neutral HfF such that 35% of the HfF+ are formed in a single rovibrational level of the electronic ground state
1Σ+, and then transferring those ions into the desired Stark levels of a single hyperfine-rovibrational manifold of the
3Δ
1 state. Rotational-state-resolved detection is accomplished by both laser-induced fluorescence and resonance-enhanced multi-photon photodissociation, where the latter is preferred as the state detection method of choice because its efficiency is two orders of magnitude higher compared to fluorescence. With the quantum state manipulation techniques developed, we performed Ramsey spectroscopy of the trapped HfF+ ions in the presence of rotating bias electric and magnetic fields, demonstrating electron spin coherence times as long as 150 ms. Finally, we present a preliminary measurement of the eEDM at the |d
e| < 10
−25 e cm level.
Advisors/Committee Members: Eric Cornell, Jun Ye, Deborah S. Jin, John L. Bohn, Carl W. Lineberger.
Subjects/Keywords: Fundamental symmetries; High-resolution spectroscopy; Molecular ions; Photodissociation; Photoionization; Raman transfer; Atomic, Molecular and Optical Physics; Physics
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APA (6th Edition):
Loh, H. (2013). Search for an electron electric dipole moment with trapped molecular ions. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/86
Chicago Manual of Style (16th Edition):
Loh, Huanqian. “Search for an electron electric dipole moment with trapped molecular ions.” 2013. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/86.
MLA Handbook (7th Edition):
Loh, Huanqian. “Search for an electron electric dipole moment with trapped molecular ions.” 2013. Web. 15 Jun 2019.
Vancouver:
Loh H. Search for an electron electric dipole moment with trapped molecular ions. [Internet] [Doctoral dissertation]. University of Colorado; 2013. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/86.
Council of Science Editors:
Loh H. Search for an electron electric dipole moment with trapped molecular ions. [Doctoral Dissertation]. University of Colorado; 2013. Available from: http://scholar.colorado.edu/phys_gradetds/86
University of Colorado
5.
Makotyn, Philip.
Experimental Studies of a Degenerate Unitary Bose Gas.
Degree: PhD, Physics, 2014, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/103
► A dilute Bose-Einstein condensate (BEC) near a Feshbach resonance provides experimental physics with a clean and controllable system to investigate strongly interacting many-body systems.…
(more)
▼ A dilute Bose-Einstein condensate (BEC) near a Feshbach resonance provides experimental physics with a clean and controllable system to investigate strongly interacting many-body systems. The ability to tune the scattering length allows BECs to be projected onto strong interactions from an initial weakly interacting state. However, historically, studying a bulk 3D strongly interacting BEC has been diffcult, as these systems are inherently unstable due to three-body inelastic collisions. Thus, 2D, 1D, lattice confined, and two component Fermi gases were used to explore the strong interactions in an ultracold gas. In this thesis, I present the first measurement of a strongly interacting 3D
85Rb BEC. I introduce our experimental system and the techniques we used to probe the BEC. I first report on probes of a BEC in the weakly interacting regime. To probe a spherical
85Rb BEC with strong interactions we implemented a novel experimental technique that allowed us to quickly change the interactions, bypassing inelastic losses. We projected the BEC onto unitarity, where the scattering length diverges and the interactions are infinite, in order to observe dynamics and the unexpectedly long lifetime of the gas. Additionally, we observe a universality of the gas with respect to the length scale set by the interparticle spacing.
Advisors/Committee Members: Deborah S. Jin, Eric A. Cornell, Cindy A. Regal, David G. Meyer, Leo Radzihovsky.
Subjects/Keywords: Bose-Einstein condensate; many-body systems; ultracold gas; strong interactions; Atomic, Molecular and Optical Physics
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APA (6th Edition):
Makotyn, P. (2014). Experimental Studies of a Degenerate Unitary Bose Gas. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/103
Chicago Manual of Style (16th Edition):
Makotyn, Philip. “Experimental Studies of a Degenerate Unitary Bose Gas.” 2014. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/103.
MLA Handbook (7th Edition):
Makotyn, Philip. “Experimental Studies of a Degenerate Unitary Bose Gas.” 2014. Web. 15 Jun 2019.
Vancouver:
Makotyn P. Experimental Studies of a Degenerate Unitary Bose Gas. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/103.
Council of Science Editors:
Makotyn P. Experimental Studies of a Degenerate Unitary Bose Gas. [Doctoral Dissertation]. University of Colorado; 2014. Available from: http://scholar.colorado.edu/phys_gradetds/103
University of Colorado
6.
Zhang, Chen.
Scattering at Ultracold Temperature: from Statistics to Dimensionality.
Degree: PhD, Physics, 2014, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/107
► In this dissertation, we study the few-body ultracold Bose-Fermi mixture and quasi-1D scattering at ultracold temperature. Degenerate quantum gases have attracted enormous attentions during…
(more)
▼ In this dissertation, we study the few-body ultracold Bose-Fermi mixture and quasi-1D scattering at ultracold temperature. Degenerate quantum gases have attracted enormous attentions during the past two decades. They have opened new platforms of quantum simulation, precision measurement and quantum chemistry. The scattering properties of degenerate quantum gases are the first things to study in order to gain insight into various novel phenomena at ultracold temperatures.
To address the role of quantum statistics at ultracold temperature, we study the spectrum and dynamics of a few-body Bose-Fermi mixtures. In particular, we focus the dynamical evolution of a few-body Bose-Fermi mixture and concentrate on its universal behavior at large inter-particle scattering length. We predict the molecule formation efficiency in many-body Bose-Fermi mixtures by mapping this critical observable in few-body calculations. We also propose that a the quantum beat experiment could be used to measure the energy of the lowest Efimov trimer at unitarity.
To address the role of dimensionality, we study confinement induced resonances and similar phenomena in general transverse confining potentials. Well-separated energy scales in different dimensions allow the creation of reduced dimensional systems at ultracold temperatures. We develop a general framework to regularize the low-energy quasi-1D scattering phase shift associated with a zero range interaction.
Lastly, we discuss future prospects for the study of an ultracold Bose-Fermi mixture, and scattering in reduced dimensional systems of a more general topology.
Advisors/Committee Members: Chris H. Greene, Ana Maria Rey, John L. Bohn, Michael Hermele, Deborah S. Jin.
Subjects/Keywords: Bose-Fermi mixture; Confinement Induced Resonance; Efimov; Hyperspherical; Quasi-1D; Scattering; Atomic, Molecular and Optical Physics
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APA (6th Edition):
Zhang, C. (2014). Scattering at Ultracold Temperature: from Statistics to Dimensionality. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/107
Chicago Manual of Style (16th Edition):
Zhang, Chen. “Scattering at Ultracold Temperature: from Statistics to Dimensionality.” 2014. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/107.
MLA Handbook (7th Edition):
Zhang, Chen. “Scattering at Ultracold Temperature: from Statistics to Dimensionality.” 2014. Web. 15 Jun 2019.
Vancouver:
Zhang C. Scattering at Ultracold Temperature: from Statistics to Dimensionality. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/107.
Council of Science Editors:
Zhang C. Scattering at Ultracold Temperature: from Statistics to Dimensionality. [Doctoral Dissertation]. University of Colorado; 2014. Available from: http://scholar.colorado.edu/phys_gradetds/107
University of Colorado
7.
Shen, Zhaochuan.
The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids.
Degree: PhD, Physics, 2014, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/123
► This dissertation presents the theoretical study of two-component fermionic gases. It firstly studies the BCS-BEC crossover for the system of the two-component fermionic gas…
(more)
▼ This dissertation presents the theoretical study of two-component fermionic gases. It firstly studies the BCS-BEC crossover for the system of the two-component fermionic gas in optical lattices. If the system were loaded into deep three-dimensional optical lattices, a tight-binding model with the lowest band is applicable. If the band is more than half-filled and by increasing the attractive interactions, then there exists a novel crossover, from a paired BCS superfluid to a BEC of holes, back to the BCS superfluid, and finally to a conventional BEC regime of diatomic molecules. If the band is less than half-filled, the crossover is similar to that without optical lattices. If the band is fully filled, a quantum phase transition from band insulator to BCS-BEC superfluid occurs. Then, this dissertation studies a model describing the one-dimensional Feshbach resonance. Because this model satisfies the Yang-Baxter equations, it was assumed that the Bethe Ansatz could solve this model. However, this dissertation demonstrates that it is not integrable by calculating the chemical potential from the Bethe Ansatz, and by studying the scattering between the bosons. To the researcher'
s knowledge, this model is the first continuum model that satisfies the Yang-Baxter equations, but is not integrable. After that, this dissertation studies the quenches in the system of paired fermionic superfluids. If the system is slightly driven from its equilibrium state, the asymptotic behaviors of this small oscillation are calculated with both
s- and p-wave interactions, and in both the BCS and the BEC regimes, under the mean field collisionless approximation.
Advisors/Committee Members: Victor Gurarie, Leo Radzihovsky, Ana Maria Rey, Deborah S. Jin, S.%20Hamilton%22%29&pagesize-30">Andrew J.
S. Hamilton.
Subjects/Keywords: BCS-BEC Crossover; Bethe Ansatz; Feshbach Resonance; Optical Lattices; Quantum Quench; Atomic, Molecular and Optical Physics; Physics
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APA ·
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APA (6th Edition):
Shen, Z. (2014). The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/123
Chicago Manual of Style (16th Edition):
Shen, Zhaochuan. “The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids.” 2014. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/123.
MLA Handbook (7th Edition):
Shen, Zhaochuan. “The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids.” 2014. Web. 15 Jun 2019.
Vancouver:
Shen Z. The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/123.
Council of Science Editors:
Shen Z. The Study of the BCS-BEC Crossover in Optical Lattices and of Quenches in Paired Superfluids. [Doctoral Dissertation]. University of Colorado; 2014. Available from: http://scholar.colorado.edu/phys_gradetds/123
University of Colorado
8.
Kaufman, Adam M.
Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.
Degree: PhD, Physics, 2015, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/140
► In this thesis, I describe the development of and scientific results from a new platform for creating ultracold atoms via single-atom control. We employ…
(more)
▼ In this thesis, I describe the development of and scientific results from a new platform for creating ultracold atoms via single-atom control. We employ Raman-sideband cooling to isolated bosonic
87Rb atoms confined within sub-micron optical tweezers, yielding single particle three- dimensional ground-state fractions of 90%. We create multiple, independent, mobile optical tweezers, which simultaneously allows multi-particle studies with single-atom microscopy and highly tunable length-scales. We employ this toolset in both of the main experiments discussed in this thesis. In one experiment, we observe Hong-Ou-Mandel interference of two bosonic atoms, each of which is independently prepared in spatially separated optical tweezers. The interference we observe is a direct consequence of the purity of the single particle quantum states produced, and the indistinguishability of the atoms. In a second experiment, we introduce a spin-degree of freedom and exploit spin-exchange dynamics, driven by the quantum-statistics of the particles, to create a spin-entangled pair of spatially separated atoms.
Advisors/Committee Members: Cindy A. Regal, Ana Maria Rey, Deborah S. Jin, David J. Wineland, Juan Restrepo.
Subjects/Keywords: Laser cooling; Quantum control; Single atoms; ultracold atoms; Atomic, Molecular and Optical Physics; Quantum Physics
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APA (6th Edition):
Kaufman, A. M. (2015). Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/140
Chicago Manual of Style (16th Edition):
Kaufman, Adam M. “Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.” 2015. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/140.
MLA Handbook (7th Edition):
Kaufman, Adam M. “Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.” 2015. Web. 15 Jun 2019.
Vancouver:
Kaufman AM. Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/140.
Council of Science Editors:
Kaufman AM. Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. [Doctoral Dissertation]. University of Colorado; 2015. Available from: http://scholar.colorado.edu/phys_gradetds/140
University of Colorado
9.
Yeo, Eng Hiang Mark.
The Laser Cooling and Magneto-Optical Trapping of the YO Molecule.
Degree: PhD, Physics, 2015, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/142
► Laser cooling and magneto-optical trapping of neutral atoms has revolutionized the field of atomic physics by providing an elegant and efficient method to produce…
(more)
▼ Laser cooling and magneto-optical trapping of neutral atoms has revolutionized the field of atomic physics by providing an elegant and efficient method to produce cold dense samples of ultracold atoms. Molecules, with their strong anisotropic dipolar interaction promises to unlock even richer phenomenon. However, due to their additional vibrational and rotational degrees of freedom, laser cooling techniques have only been extended to a small set of diatomic molecules.
In this thesis, we demonstrate the first magneto-optical trapping of a diatomic molecule using a quasi-cycling transition and an oscillating quadrupole magnetic field. The transverse temperature of a cryogenically produced YO beam was reduced from 25 mK to 10 mK via doppler cooling and further reduced to 2 mK with the addition of magneto-optical trapping forces.
The optical cycling in YO is complicated by the presence of an intermediate electronic state, as decays through this state lead to optical pumping into dark rotational states. Thus, we also demonstrate the mixing of rotational states in the ground electronic state using microwave radiation. This technique greatly enhances optical cycling, leading to a factor of 4 increase in the YO beam fluorescence and is used in conjunction with a frequency modulated and chirped continuous wave laser to longitudinally slow the YO beam. We generate YO molecules below 10 m/
s that are directly loadable into a three-dimensional magneto-optical trap. This mixing technique provides an alternative to maintaining rotational closure and should extend laser cooling to a larger set of molecules.
Advisors/Committee Members: Jun Ye, Deborah S. Jin, John L. Bohn, Heather Lewandowski, Carl Lineberger.
Subjects/Keywords: Cryogenics; Frequency Combs; Mechanical effects of light on atoms; molecules; and ions; Slowing and cooling of molecules; Trapping of molecules; Optics; Quantum Physics
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APA (6th Edition):
Yeo, E. H. M. (2015). The Laser Cooling and Magneto-Optical Trapping of the YO Molecule. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/142
Chicago Manual of Style (16th Edition):
Yeo, Eng Hiang Mark. “The Laser Cooling and Magneto-Optical Trapping of the YO Molecule.” 2015. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/142.
MLA Handbook (7th Edition):
Yeo, Eng Hiang Mark. “The Laser Cooling and Magneto-Optical Trapping of the YO Molecule.” 2015. Web. 15 Jun 2019.
Vancouver:
Yeo EHM. The Laser Cooling and Magneto-Optical Trapping of the YO Molecule. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/142.
Council of Science Editors:
Yeo EHM. The Laser Cooling and Magneto-Optical Trapping of the YO Molecule. [Doctoral Dissertation]. University of Colorado; 2015. Available from: http://scholar.colorado.edu/phys_gradetds/142
University of Colorado
10.
Hu, Ming-Guang.
Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms.
Degree: PhD, Physics, 2015, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/157
► An ultracold Bose-Fermi gas mixture of 40K and 87Rb atoms has tunable interspecies interactions and therefore provides a fantastic platform for exploring not only…
(more)
▼ An ultracold Bose-Fermi gas mixture of
40K and
87Rb atoms has tunable interspecies interactions and therefore provides a fantastic platform for exploring not only few-body physics such as Feshbach molecule formation and Efimov trimers, but also many-body physics including Bose polarons, quantum Hall physics and so on. In this thesis, I present experimental evidence of Bose polarons in cold atoms obtained using radio-frequency spectroscopy to measure the excitation spectrum of fermionic
40K impurities resonantly interacting with a BEC of
87Rb atoms. These Bose polarons originate from the dressing of an impurity coupled to its environment, which is an important paradigm in quantum many-body physics. I also present initial work that launches an exciting new direction for our experiment, which is exploring rotating quantum gases. Goals for this work include studying both rotating Bose and Fermi superfluids with tunable interactions as well as working toward rapidly rotating quantum gases in the quantum Hall regime. For these goals, a new all-optical trap for rotating gases was designed, implemented, and tested using a
87Rb Bose-Einstein condensate.
Advisors/Committee Members: Deborah S. Jin, Eric A. Cornell, Jun Ye, Victor Gurarie, Kelvin Wagner.
Subjects/Keywords: BEC; laser stabilization; polaron; rotating gas; Ultracold atoms; vortex; Atomic, Molecular and Optical Physics
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APA (6th Edition):
Hu, M. (2015). Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/157
Chicago Manual of Style (16th Edition):
Hu, Ming-Guang. “Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms.” 2015. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/157.
MLA Handbook (7th Edition):
Hu, Ming-Guang. “Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms.” 2015. Web. 15 Jun 2019.
Vancouver:
Hu M. Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/157.
Council of Science Editors:
Hu M. Bose Polarons and Rotating Gases in an Ultracold Bose-Fermi Gas Mixture of 40K and 87Rb Atoms. [Doctoral Dissertation]. University of Colorado; 2015. Available from: http://scholar.colorado.edu/phys_gradetds/157
University of Colorado
11.
Moses, Steven Aaron.
A Quantum Gas of Polar Molecules in an Optical Lattice.
Degree: PhD, Physics, 2016, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/161
► Ultracold polar molecules, because of their long-range, spatially anisotropic interactions, are a new quantum system in which to study novel many-body phenomena. In our…
(more)
▼ Ultracold polar molecules, because of their long-range, spatially anisotropic interactions, are a new quantum system in which to study novel many-body phenomena. In our lab, we have produced the first quantum gas of 40K87Rb polar molecules. These molecules were found to undergo exothermic chemical reactions, and this led to interesting studies of chemistry near absolute zero. By creating the molecules at individual sites of a 3D optical lattice, we completely suppress these chemical reactions, and the polar molecule gas becomes stable and lives for tens of seconds. This thesis documents our efforts to explore coherent, many-body phenomena resulting from long-range dipolar interactions in the lattice. By encoding a spin-1=2 system in the rotational states of the molecules, we were able to realize spin-exchange interactions based on a spin Hamiltonian, which is one of the first steps in studying quantum magnetism with polar molecules. While this study was the first realization of such coherent dipolar interactions with polar molecules in a lattice, its full potential was limited by the low lattice filling fractions. Using our ability to exquisitely control the initial atomic gas mixture, we loaded a Mott insulator of Rb and a band insulator of K into the lattice. This quantum synthesis approach led to significantly higher molecular filling fractions and represents the first fully connected system of polar molecules in an optical lattice. This low-entropy quantum gas of polar molecules opens the door to interesting quantum simulations, which should be attainable in the next generation of the experiment.
Advisors/Committee Members: Jun Ye, Deborah S. Jin, Ana Maria Rey, Eric Cornell, Carl Lineberger.
Subjects/Keywords: Atomic physics; Optical lattices; Quantum simulation; Ultracold molecules; Physics
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Moses, S. A. (2016). A Quantum Gas of Polar Molecules in an Optical Lattice. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/161
Chicago Manual of Style (16th Edition):
Moses, Steven Aaron. “A Quantum Gas of Polar Molecules in an Optical Lattice.” 2016. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/161.
MLA Handbook (7th Edition):
Moses, Steven Aaron. “A Quantum Gas of Polar Molecules in an Optical Lattice.” 2016. Web. 15 Jun 2019.
Vancouver:
Moses SA. A Quantum Gas of Polar Molecules in an Optical Lattice. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/161.
Council of Science Editors:
Moses SA. A Quantum Gas of Polar Molecules in an Optical Lattice. [Doctoral Dissertation]. University of Colorado; 2016. Available from: http://scholar.colorado.edu/phys_gradetds/161
University of Colorado
12.
Wild, Robert Johannes.
Contact Measurements on a Strongly Interacting Bose Gas.
Degree: PhD, Physics, 2012, University of Colorado
URL: http://scholar.colorado.edu/phys_gradetds/56
Subjects/Keywords: Atomic, Molecular and Optical Physics; Condensed Matter Physics
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wild, R. J. (2012). Contact Measurements on a Strongly Interacting Bose Gas. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/phys_gradetds/56
Chicago Manual of Style (16th Edition):
Wild, Robert Johannes. “Contact Measurements on a Strongly Interacting Bose Gas.” 2012. Doctoral Dissertation, University of Colorado. Accessed June 15, 2019.
http://scholar.colorado.edu/phys_gradetds/56.
MLA Handbook (7th Edition):
Wild, Robert Johannes. “Contact Measurements on a Strongly Interacting Bose Gas.” 2012. Web. 15 Jun 2019.
Vancouver:
Wild RJ. Contact Measurements on a Strongly Interacting Bose Gas. [Internet] [Doctoral dissertation]. University of Colorado; 2012. [cited 2019 Jun 15].
Available from: http://scholar.colorado.edu/phys_gradetds/56.
Council of Science Editors:
Wild RJ. Contact Measurements on a Strongly Interacting Bose Gas. [Doctoral Dissertation]. University of Colorado; 2012. Available from: http://scholar.colorado.edu/phys_gradetds/56
. 
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