Thursday, February 17, 2011, 1:30 pm — Small seminar room, Bldg. 510
Motivated by recent experiments in low-dimensional trapped fermionic
superfluids we study quasi-1D superfluid with imbalanced populations
between two hyperfine states and analyze its properties using the exact
mean field solution for the order parameter. When population imbalance
exceeds some critical value the superfluid order parameter develops
spatial inhomogeneities and can be described by a soliton lattice
formation. Emergence of the soliton lattice is accompanied by the
formation of the spin density wave with the majority fermions residing at
the points in space where Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) order
parameter vanishes. We show that the presence of the spin density wave
leads to the formation of the band of the "subgap states", which serves
as a hallmark of the quasi-1D FFLO state. We employ the soliton lattice
description to discuss the possibilities for the experimental detection
of the quasi-1D FFLO phase: elastic and inelastic optical Bragg
scattering experiments and radio-frequency spectroscopy. We demonstrate
that these measurements allow one to extract necessary information about
the inhomogeneous superfluid phase to unambiguously identify quasi-1D
FFLO state. Reference http://arxiv.org/abs/1010.4033
Hosted by: Alexei Tsvelik
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