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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)

FA31 ()


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.