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KTH/Nordita/SU seminar in Theoretical Physics

Spin-imbalanced ultra-cold atomic Fermi gases in one dimension and the prospects for FFLO superconductivity

by Dr Paata Kakashvili (Nordita)

Europe/Stockholm
FA31 ()

FA31

Description
Growing expertise to engineer, manipulate and probe different analogs of condensed matter systems allows to probe properties of exotic pairing states such as the Fulde-Ferrell-Larkin-Ovchinnikov state. Inspired by recent experiments at Rice university, we are studying the pairing in spin-imbalanced ultra-cold atomic system of fermions in one dimension. Experimentally, 1D tubes are defined by turning on a 2D optical lattice and interaction between atoms is tuned using a suitable Feshbach resonance. Calculations are done using the Bethe Ansatz technique and the trap is incorporated into the solution via local density (Thomas-Fermi) approximation. The thermodynamic-Bethe-Ansatz equations are solved numerically and different density profiles (total-, spin- and entropy-densities) are calculated in the trap for different finite temperatures. A scheme to identify the phase diagram using total density profiles in the trap is proposed that would be immediately useful for experimentalists.