title: Spin-orbit coupled degenerate Fermi gases.
abstract: In this Letter, we report the first experimental realization and investigation of a spin-orbit coupled Fermi gas. Both spin dephasing in spin dynamics and momentum distribution asymmetry of the equilibrium state are observed as hallmarks of spin-orbit coupling in a Fermi gas. The single particle dispersion is mapped out by using momentum-resolved radio-frequency spectroscopy. From momentum distribution and momentum-resolved radio-frequency spectroscopy, we observe the change of fermion population in different helicity branches consistent with a finite temperature calculation, which indicates that a Lifshitz transition of the Fermi surface topology change can be found by further cooling the system.
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, People's Republic of China.
authors.forename: Pengjun
authors.initials: P
authors.lastname: Wang
authors.forename: Zeng-Qiang
authors.initials: ZQ
authors.lastname: Yu
authors.forename: Zhengkun
authors.initials: Z
authors.lastname: Fu
authors.forename: Jiao
authors.initials: J
authors.lastname: Miao
authors.forename: Lianghui
authors.initials: L
authors.lastname: Huang
authors.forename: Shijie
authors.initials: S
authors.lastname: Chai
authors.forename: Hui
authors.initials: H
authors.lastname: Zhai
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang