Finite temperature phase diagram of trapped Fermi gases with population imbalance

Details Finite temperature phase diagram of trapped Fermi gases with population imbalance Finite temperature phase diagram of trapped Fermi gases with population imbalance

2007-06-08

arxiv.org/abs/0706.1253v2

Phys. Rev. A 76, 042710 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 7 figures

Scientific paper

10.1103/PhysRevA.76.042710

We consider a trapped Fermi gas with population imbalance at finite temperatures and map out the detailed phase diagram across a wide Feshbach resonance. We take the Larkin-Ovchinnikov-Fulde-Ferrel (LOFF) state into consideration and minimize the thermodynamical potential to ensure stability. Under the local density approximation, we conclude that a stable LOFF state is present only on the BCS side of the Feshbach resonance, but not on the BEC side or at unitarity. Furthermore, even on the BCS side, a LOFF state is restricted at low temperatures and in a small region of the trap, which makes a direct observation of LOFF state a challenging task.

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