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

by Igor Kuzmenko

at Condensed Matter Theory Seminar

Wed, 28 Mar 2018, 13:30
Physics building (#54) room 207


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 gt 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 is straightforward

Created on 24-03-2018 by Bar Lev, Yevgeny (ybarlev)
Updaded on 24-03-2018 by Bar Lev, Yevgeny (ybarlev)