Fulde-Ferrell states and Berezinskii-Kosterlitz-Thouless phase transition in two-dimensional imbalanced Fermi gases

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

31 Sitaatiot (Scopus)
310 Lataukset (Pure)

Abstrakti

We study the superfluid properties of two-dimensional spin-population-imbalanced Fermi gases to explore the interplay between the Berezinskii-Kosterlitz-Thouless (BKT) phase transition and the possible instability towards the Fulde-Ferrell (FF) state. By the mean-field approximation together with quantum fluctuations, we obtain phase diagrams as functions of temperature, chemical potential imbalance, and binding energy. We find that the fluctuations change the mean-field phase diagram significantly. We also address possible effects of the phase separation and/or the anisotropic FF phase to the BKT mechanism. The superfluid density tensor of the FF state is obtained, and its transverse component is found always vanishing. This causes divergent fluctuations and possibly precludes the existence of the FF state at any nonzero temperature.
AlkuperäiskieliEnglanti
Artikkeli014507
Sivut1-18
Sivumäärä18
JulkaisuPhysical Review B
Vuosikerta89
Numero1
DOI - pysyväislinkit
TilaJulkaistu - 1 tammikuuta 2014
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Tutkimusalat

  • BKT
  • FFLO,

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