Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for +publisher:"Mississippi State University" +contributor:("Dr. Jinwu Ye"). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters

1. Yu, Yi-Xiang. Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity.

Degree: PhD, Physics and Astronomy, 2015, Mississippi State University

This dissertation introduces some new properties of both superfluid phases of fermions with spin-orbit coupling (SOC) and superradiant phases of photons in an optical cavity. The effects of SOC on the phase transition between normal and superfluid phase are revealed; an unconventional crossover driven by SOC from the Bardeen-Cooper-Schrieffer (BCS) state to the Bose-Einstein condensate (BEC) state is verified in three different systems; and two kinds of excitations, a Goldstone mode and a Higgs mode, are demonstrated to occur in a quantum optical system. We investigate the BCS superfluid state of two-component atomic Fermi gases in the presence of three kinds of SOCs. We find that SOC drives a class of BCS to BEC crossover that is different from the conventional one without SOC. Here, we extend the concepts of the coherence length and Cooper-pair size in the absence of SOC to Fermi systems with SOC. We study the dependence of chemical potential, coherence length, and Cooper-pair size on the SOC strength and the scattering length in three dimensions (3D) (or the twobody binding energy in two dimensions (2D)) for three attractively interacting Fermi gases with 3D Rashba, 3D Weyl, and 2D Rashba SOC respectively. By adding a population imbalance to a Fermi gas with Rashba-type SOC, we also map out the finite-temperature phase diagram. Due to a competition between SOC and population imbalance, the finite-temperature phase diagram reveals a large variety of new features, including the expanding of the superfluid state regime and the shrinking of both the phase separation and the normal regimes. We find that the tricritical point moves toward a regime of low temperature, high magnetic field, and high polarization as the SOC strength increases. Besides Fermi fluids, this dissertation also gives a new angle of view on the superradiant phase in the Dicke model. Here, we demonstrate that Goldstone and Higgs modes can be observed in an optical system with only a few atoms inside a cavity. The model we study is the <i>U</i>(1)/<i>Z</i>2 Dicke model with N qubits (two-level atoms) coupled to a single photon mode. Advisors/Committee Members: Dr. Yaroslav Koshka (committee member), Dr. R. Torsten Clay (committee member), Dr. Steven R. Gwaltney (committee member), Dr. Seong-Gon Kim (committee member), Dr. Jinwu Ye (chair).

Subjects/Keywords: Cooper-pair size; superradiant phase; Dicke model; Goldstone mode; Higgs mode; phase diagram; Bose-Einstein condensate; Fermi gas; spin-orbit coupling

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Yu, Y. (2015). Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-05142015-120012/ ;

Chicago Manual of Style (16th Edition):

Yu, Yi-Xiang. “Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity.” 2015. Doctoral Dissertation, Mississippi State University. Accessed January 23, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-05142015-120012/ ;.

MLA Handbook (7th Edition):

Yu, Yi-Xiang. “Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity.” 2015. Web. 23 Jan 2020.

Vancouver:

Yu Y. Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity. [Internet] [Doctoral dissertation]. Mississippi State University; 2015. [cited 2020 Jan 23]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-05142015-120012/ ;.

Council of Science Editors:

Yu Y. Superfluids of Fermions in spin-orbit coupled systems and photons inside a cavity. [Doctoral Dissertation]. Mississippi State University; 2015. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-05142015-120012/ ;

.