subject:(Time resolved Faraday)

1. Sanches Piaia, Monica. Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat.

Degree: Docteur es, Physique de la matière condensée, 2014, Université de Strasbourg

URL: http://www.theses.fr/2014STRAE024

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Un des objectifs du Femtomagnetisme est de contrôler l’aimantation des matériaux avec des impulsions laser femtoseconde. Il a été démontré qu’une réponse magnéto-optique (MO) cohérente… (more)

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Un des objectifs du Femtomagnetisme est de contrôler l’aimantation des matériaux avec des impulsions laser femtoseconde. Il a été démontré qu’une réponse magnéto-optique (MO) cohérente a lieu avant la thermalisation des populations de spins dans une configuration pompe-sonde MOKE. Elle résulte du couplage cohérent spin-photon dû à l’interaction spin-orbite. Une description simplifiée de cet effet a été faite en tenant compte d’un système à huit niveaux couplés au champ laser. La cohérence MO est définie par le temps de déphasage dépendent du champ T2MO. Dans ce travail, il est montré que la réponse MO cohérente d’un grenat dopé au bismuth peut être mesurée directement avec différentes configurations de mélange à quatre ondes MO. L’importance de connaître la phase spectrale de l’impulsion pour obtenir T2MO a été étudié. Avec des impulsions de 10fs dans le proche infra-rouge, une mesure de T2MO donne (2.8+/-1)fs, c. à d., du même ordre de grandeur que le temps de déphasage des charges.

One of the goals of Femtomagnetism is to manipulate the magnetization of materials using femtosecond optical pulses. It has been shown in ferromagnetic films that a magneto-optical (MO) coherent response takes place before the thermalization of the spins populations in a pump and probe MOKE experiment. It results from the coherent spin-photon coupling mediated by the spin-orbit interaction. A simplified description of this effect has been made by considering an eight-level system coupled with the laser field. The MO coherence can be defined by the magnetic field dependent dephasing time T2MO. In the present work, it is shown that the coherent MO response of a bismuth-doped garnet can be directly measured in different degenerated MO four-wave mixing configurations. The importance of well-knowing the spectral phase of the pulse to measure T2MO was studied. Using 10fs near infra-red pulses, T2MO was shown to be (2.8+/-1)fs that is of the same order of the charges dephasing time.

Advisors/Committee Members: Bigot, Jean-Yves (thesis director).

Subjects/Keywords: Femtomagnetisme; Interaction spin-orbite; Mélange à quatre onde; Dynamique ultrarapide d’aimantation; Pompe-sonde; Dynamique de spins et de charges; Faraday résolu en temps; Réponse magnéto-optique cohérente; Femtomagnetism; Spin-orbit interaction; Four-wave mixing; Ultrafast magnetization dynamics; Pump and probe; Spins and charges dynamics; Time-resolved Faraday; Coherent magneto-optical response; 530.4

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sanches Piaia, M. (2014). Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2014STRAE024

Chicago Manual of Style (16^th Edition):

Sanches Piaia, Monica. “Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat.” 2014. Doctoral Dissertation, Université de Strasbourg. Accessed March 06, 2021. http://www.theses.fr/2014STRAE024.

MLA Handbook (7^th Edition):

Sanches Piaia, Monica. “Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat.” 2014. Web. 06 Mar 2021.

Vancouver:

Sanches Piaia M. Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2014. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2014STRAE024.

Council of Science Editors:

Sanches Piaia M. Femtosecond magneto-optical four-wave mixing in Garnet films : Mélange à quatre ondes magnéto-optique femtoseconde dans les films de Grenat. [Doctoral Dissertation]. Université de Strasbourg; 2014. Available from: http://www.theses.fr/2014STRAE024

University of Victoria

2. LaForge, Joshua Michael. A polarization sensitive interferometer for Faraday rotation detection.

Degree: Dept. of Physics and Astronomy, 2007, University of Victoria

URL: http://hdl.handle.net/1828/178

► Time-resolved Faraday rotation (TRFR) is a pulsed laser pump/probe optical measurement used to characterize electron spin dynamics in semiconductor materials. A Mach-Zehnder type interferometer with… (more)

Subjects/Keywords: interferometer; spintronics; Mach-Zehnder; time-resolved Faraday-rotation; Faraday rotation; Faraday effect; semiconductor; gallium arsenide; pulsed laser; ultrafast spectrometry; UVic Subject Index::Sciences and Engineering::Physics::Condensed matter; UVic Subject Index::Sciences and Engineering::Physics::Optics

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APA (6^th Edition):

LaForge, J. M. (2007). A polarization sensitive interferometer for Faraday rotation detection. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/178

Chicago Manual of Style (16^th Edition):

LaForge, Joshua Michael. “A polarization sensitive interferometer for Faraday rotation detection.” 2007. Masters Thesis, University of Victoria. Accessed March 06, 2021. http://hdl.handle.net/1828/178.

MLA Handbook (7^th Edition):

LaForge, Joshua Michael. “A polarization sensitive interferometer for Faraday rotation detection.” 2007. Web. 06 Mar 2021.

Vancouver:

LaForge JM. A polarization sensitive interferometer for Faraday rotation detection. [Internet] [Masters thesis]. University of Victoria; 2007. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1828/178.

Council of Science Editors:

LaForge JM. A polarization sensitive interferometer for Faraday rotation detection. [Masters Thesis]. University of Victoria; 2007. Available from: http://hdl.handle.net/1828/178

Virginia Tech

3. Nontapot, Kanokwan. Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors.

Degree: PhD, Physics, 2008, Virginia Tech

URL: http://hdl.handle.net/10919/28712

► In recent years, spin relaxation, injection, and manipulation in semiconductors have attracted considerable interest because of several potential applications in "spintronic" devices and the necessity… (more)

▼ In recent years, spin relaxation, injection, and manipulation in semiconductors have attracted considerable interest because of several potential applications in "spintronic" devices and the necessity to understand and control spin-based phenomena. In light of the growing interest in spin-related phenomena and devices, there is now renewed interest in the science and engineering of narrow gap semiconductors (NGS). NGS based heterostructures are particularly interesting for spintronic applications due to their large spin-orbit coupling, which leads to considerable zero-field spin splitting. NGS are also candidates for electronic applications, such as high-speed and low-power microprocessors; as reported recently by Intel. Furthermore, as switching rates in electronic devices are pushed to even higher frequencies, it is important to understand dynamics in semiconductors such as NGS on femtosecond time-scales. In this thesis, time-resolved studies of magnetic and non-magnetic NGS using ultrafast-laser spectroscopy techniques such as pump-probe spectroscopy and magneto-optical Kerr/Faraday effect, are reported. Our samples include: InSb-based quantum wells with different confinement potentials; InMnSb films, the newest III-V ferromagnetic semiconductors; and InAs films. The samples for these studies have been provided by the groups of Prof. Santos at the University of Oklahoma, Prof. Furdyna at the University of Notre Dame, and Prof. Guido at Virginia Tech. The objectives in this thesis have been to: a) understand charge/spin dynamics in NGS with novel confinement potentials, b) probe the effect of magnetic impurities on the spin/charge dynamics, and c) develop concepts for spin based device applications. Several specific questions and concepts have been addressed including: the effect of large spin-orbit interaction in NGS on the dynamics, how large Rashba spin splitting in these materials affect the spin coherence life time, and carrier/spin dynamics in ferromagnetic semiconductor structures. Advisors/Committee Members: Khodaparast, Giti A. (committeechair), Pitt, Mark L. (committee member), Heflin, James R. (committee member), Schmittmann, Beate (committee member).

Subjects/Keywords: Narrow gap semiconductors; Ultrafast laser spectroscopy; Spin dynamics; Magneto-optical Kerr/Faraday effect; Time resolved pump/probe

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nontapot, K. (2008). Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28712

Chicago Manual of Style (16^th Edition):

Nontapot, Kanokwan. “Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors.” 2008. Doctoral Dissertation, Virginia Tech. Accessed March 06, 2021. http://hdl.handle.net/10919/28712.

MLA Handbook (7^th Edition):

Nontapot, Kanokwan. “Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors.” 2008. Web. 06 Mar 2021.

Vancouver:

Nontapot K. Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors. [Internet] [Doctoral dissertation]. Virginia Tech; 2008. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10919/28712.

Council of Science Editors:

Nontapot K. Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors. [Doctoral Dissertation]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/28712

4. Khastehdel Fumani, Ahmad. QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS.

Degree: PhD, Physics, 2016, Case Western Reserve University School of Graduate Studies

URL: http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739

► In this thesis we studied the signature of quantum confined electronic structure of CdSe nanocrystal quantum dots (NCQDs) in the electron spin behavior via time… (more)

Subjects/Keywords: Physics; Optics; electron spin; optical spin pumping; nanocrystal quantum dot; time resolved Faraday rotation, CdSe

…behavior via time resolved Faraday rotation(TRFR) measurement at room temperature. We… …photoluminescence properties. We use time resolved Faraday rotation (TRFR) pumpprobe measurement… …in the measurements we present. 1.9 Time resoved Faraday rotation, experimental method… …An optical time resolved pump-probe method is used for time dependent spin excitation and… …utilized laser is longer than what people often use in fast time resolved measurements which is…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khastehdel Fumani, A. (2016). QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS. (Doctoral Dissertation). Case Western Reserve University School of Graduate Studies. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739

Chicago Manual of Style (16^th Edition):

Khastehdel Fumani, Ahmad. “QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS.” 2016. Doctoral Dissertation, Case Western Reserve University School of Graduate Studies. Accessed March 06, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739.

MLA Handbook (7^th Edition):

Khastehdel Fumani, Ahmad. “QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS.” 2016. Web. 06 Mar 2021.

Vancouver:

Khastehdel Fumani A. QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS. [Internet] [Doctoral dissertation]. Case Western Reserve University School of Graduate Studies; 2016. [cited 2021 Mar 06]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739.

Council of Science Editors:

Khastehdel Fumani A. QUANTUM CONFINED STATES AND ROOM TEMPERATURE SPIN COHERENCE IN SEMICONDUCTOR NANOCRYSTAL QUANTUM DOTS. [Doctoral Dissertation]. Case Western Reserve University School of Graduate Studies; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1449151739

Universidade Estadual de Campinas

5. Gonzalez Hernandez, Felix Guillermo. Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots.

Degree: 2007, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852

► Abstract: Experimental measurements were carried out to determine the scales of the relaxation and decoherence time for the electronic spin as quantum bit. The structure… (more)

▼ Abstract: Experimental measurements were carried out to determine the scales of the relaxation and decoherence time for the electronic spin as quantum bit. The structure of the exciton states was investigated with the objective to serve as intermediate states in the spin manipulation. The system studied for the implementation of the quantum computation is an ensemble of self-assembled semiconductor quantum dots. Two subjects serve as central axes of the three experiments developed in this thesis: the spin polarization and the Landé g-factor. In the first experiment, when including the effect of the thermal reservoir, the degree of spin polarization (populations for the up and down levels) was measured for layers s and p. The splitting of the orbital levels in spin sublevels allowed to get the magnitude of factor g for these states. Changing the orientation of the magnetic field, the g-tensor anisotropies and its relation with the details of the confinement potential had been observed. These characteristics had allowed to infer the relaxation time T1. The time resolved polarization measurement was carried out by optical pump-probe spectroscopy. The pulses of light and the transverse magnetic field allow the initialization of a net polarization. The Kerr rotation allowed to observe oscillations of this polarization around the magnetic field with frequency determined for factor g. The loss of the spin phase coherence results in the decay of these oscillations in a time scale T2. Measurements carried out in an ensemble of spins imply that the decoherence time is limited by the ensemble dephasing time T¤2 < T2. A technique similar to the spin-echo refocalization in nuclear magnetic resonance experiments using laser pulses was applied to reverse the ensemble dephasing. The possibility to measure the echo signal and the decoherence time was measured as a function of the temperature. The structure of exciton levels and its distribution in ensemble were also studied with pump-probe spectroscopy. Quantum beats were observed be-tween the fine structure exciton levels for 0D and 2D systems, yet limited by the recombination time Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Ribeiro, Gilberto Medeiros (advisor), Universidade Estadual de Campinas. Instituto de Física Gleb Wataghin (institution), Programa de Pós-Graduação em Física (nameofprogram), Tamborenea, Pablo Ignacio (committee member), Bonagamba, Tito José (committee member), Miranda, Eduardo (committee member), Brasil, Maria José Santos Pompeu (committee member).

Subjects/Keywords: Pontos quânticos; Decoerência; Spin eletrônico; Fator g; Rotação de Faraday resolvida no tempo; Magneto-capacitancia; Estrutura fina do exciton; Quantum dots; Decoherence; Electronic spin; G factor; Time-resolved Faraday rotation; Magneto-capacitance; Exciton fine structure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gonzalez Hernandez, F. G. (2007). Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gonzalez Hernandez, Felix Guillermo. “Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots.” 2007. Thesis, Universidade Estadual de Campinas. Accessed March 06, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gonzalez Hernandez, Felix Guillermo. “Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots.” 2007. Web. 06 Mar 2021.

Vancouver:

Gonzalez Hernandez FG. Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots. [Internet] [Thesis]. Universidade Estadual de Campinas; 2007. [cited 2021 Mar 06]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gonzalez Hernandez FG. Tempos de relaxação e decoerência em ensembles de pontos quânticos: Decoherence and relaxation time in an ensemble of quantum dots. [Thesis]. Universidade Estadual de Campinas; 2007. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/277852

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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