[Phys-seminars] 2018-03-28 Condensed Matter Theory Seminar

smoshe smoshe at bgu.ac.il
Sat Mar 24 21:36:35 IDT 2018


Condensed Matter Theory Seminar

 DATE: 28-03-18

 TIME: 13:30

 PLACE: Physics building (#54) room 207

TITLE: 
Spin-Orbit Coupling and Topological States in F=3/2 Cold Fermi Gas

SPEAKER: 
Igor Kuzmenko, Ben Gurion University

ABSTRACT/COMMENTS: 
We study the possible occurrence of topological insulators for 2D fermions of high spin. They can be realized in cold fermion systems with ground-state atomic spin F>1/2, if the optical potential is properly designed, and spin-orbit coupling is relevant. The latter is shown to be induced by letting the fermions interact with a specially tuned arrangement of polarized laser beams. When the system is subject to a perpendicular magnetic field, time reversal symmetry is broken but the ensuing Hamiltonian is still endowed with a mirror symmetry. Topological insulators for fermions of higher spins are fundamentally distinct from those pertaining to spin 1/2. The underlying physics reveals a plethora of positive and negative mirror Chern numbers, respectively corresponding to chiral and anti-chiral edge states. Here, for simplicity, we concentrate on the case F=3/2 (which is suitable for 6Li or 2H atoms) but extension to higher spins (such as 40K whose ground-state spin is F=9/2), i
 s straightforward.


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