A unified description of pairing effects, BKT physics, and superfluidity of 2D interacting Bose gases

Details A unified description of pairing effects, BKT physics, and superfluidity of 2D interacting Bose gases A unified description of pairing effects, BKT physics, and superfluidity of 2D interacting Bose gases

2012-03-15

arxiv.org/abs/1203.3254v1

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

We develop a unified description for two-dimensional (2D) interacting Bose gases at arbitrary temperatures. The genuine Bose-Einstein condensation with long-range coherence only survives at zero temperature. At finite temperatures, many-body pairing effects introduce a finite amplitude of the pairing density, which results in a finite superfluid density. The superfluid phase is only stable below the Berenzinskii-Kosterlitz-Thouless (BKT) temperature due to phase fluctuations. We present a finite-temperature phase diagram of 2D Bose gases. One salient signature of the finite amplitude of the pairing density field is a two-peak structure in the single-particle spectral function, resembling that of the pseudogap phase in 2D attractive Fermi gases.

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