Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-03-11
Phys. Rev. A 79, 053637 (2009)
Physics
Condensed Matter
Statistical Mechanics
3 figures
Scientific paper
10.1103/PhysRevA.79.053637
The Berezinskii-Kosterlitz-Thouless (BKT) mechanism describes the breakdown of superfluidity in a two-dimensional Bose gas or a two-dimensional gas of paired fermions. In the latter case, a population imbalance between the two pairing partners in the Fermi mixture is known to influence pairing characteristics. Here, we investigate the effects of imbalance on the two-dimensional BKT superfluid transition, and show that superfluidity is even more sensitive to imbalance than for three dimensional systems. Finite-temperature phase diagrams are derived using the functional integral formalism in combination with a hydrodynamic action functional for the phase fluctuations. This allow to identify a phase separation region and tricritical points due to imbalance. In contrast to superfluidity in the three-dimensional case, the effect of imbalance is also pronounced in the strong-coupling regime.
Devreese J. T.
Klimin Sergei N.
Tempere Jacques
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