BCS-BEC crossover and topological phase transition in 3D spin-orbit coupled degenerate Fermi gases.

Content Provider	Semantic Scholar
Author	Gong, Ming Tewari, Sumanta Zhang, Chuanwei
Copyright Year	2011
Abstract	We investigate the BCS-BEC crossover in three-dimensional degenerate Fermi gases in the presence of spin-orbit coupling (SOC) and Zeeman field. We show that the superfluid order parameter destroyed by a large Zeeman field can be restored by the SOC. With increasing strengths of the Zeeman field, there is a series of topological quantum phase transitions from a nontopological superfluid state with fully gapped fermionic spectrum to a topological superfluid state with four topologically protected Fermi points (i.e., nodes in the quasiparticle excitation gap) and then to a second topological superfluid state with only two Fermi points. The quasiparticle excitations near the Fermi points realize the long-sought low-temperature analog of Weyl fermions of particle physics. We show that the topological phase transitions can be probed using the experimentally realized momentum-resolved photoemission spectroscopy.
Starting Page	195303
Ending Page	195303
Page Count	1
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.utdallas.edu/~cxz124830/article/PRL-2011-2.pdf
PubMed reference number	22181619v1
Volume Number	107
Issue Number	19
Journal	Physical review letters
Language	English
Access Restriction	Open
Subject Keyword	Abnormal degeneration Analog Excitation Femtometer Gases Phase Transition Photoelectron Spectroscopy Population Parameter
Content Type	Text
Resource Type	Article