[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

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

Igor Kuzmenko, Ben Gurion University

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.

More information about the Phys-seminars mailing list