Speaker
Prof.
Carlos Sa de Melo
(Georgia Tech (USA))
Description
I discuss the creation of parity violating Fermi superfluids in
the presence of non-Abelian gauge fields involving spin-orbit
coupling and crossed Zeeman fields. I focus on spin-orbit
coupling with equal Rashba and Dresselhaus (ERD)
strengths which has been realized experimentally in ultra-
cold atoms, but also discuss the case of arbitrary mixing of
Rashba and Dresselhaus (RD) and of Rashba-only (RO) spin-
orbit coupling. To illustrate the emergence of parity violation
in the superfluid, I analyse first the excitation spectrum in
the normal state and show that the generalized helicity
bands do not have inversion symmetry in momentum space
when crossed Zeeman fields are present. This is also
reflected in the superfluid phase, where the order
parameter tensor in the generalized helicity basis violates
parity. However, the pairing fields in singlet and triplet
channels of the generalized helicity basis are still parity even
and odd, respectively. Parity violation is further reflected on
ground state properties such as the spin-resolved
momentum distribution, and in excitation properties such
as the spin-dependent spectral function and density of
states.
Primary author
Prof.
Carlos Sa de Melo
(Georgia Tech (USA))
