Sound velocity and dimensional crossover in a superfluid Fermi gas in an optical lattice

T. Koponen; J. P. Martikainen; J. Kinnunen; P. Törmä

doi:10.1103/PhysRevA.73.033620

Sound velocity and dimensional crossover in a superfluid Fermi gas in an optical lattice

T. Koponen^*, J. P. Martikainen, J. Kinnunen, P. Törmä

^*Corresponding author for this work

Not published at Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

27 Citations (Scopus)

Abstract

We study the sound velocity in cubic and noncubic three-dimensional optical lattices. We show how the van Hove singularity of the free Fermi gas is smoothed by interactions and eventually vanishes when interactions are strong enough. For noncubic lattices, we show that the speed of sound (Bogoliubov-Anderson phonon) shows clear signatures of dimensional crossover both in the one- and two-dimensional limits.

Original language	English
Article number	033620
Pages (from-to)	1-8
Number of pages	8
Journal	Physical Review A
Volume	73
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.73.033620
Publication status	Published - Mar 2006
MoE publication type	A1 Journal article-refereed

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10.1103/PhysRevA.73.033620

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abstract = "We study the sound velocity in cubic and noncubic three-dimensional optical lattices. We show how the van Hove singularity of the free Fermi gas is smoothed by interactions and eventually vanishes when interactions are strong enough. For noncubic lattices, we show that the speed of sound (Bogoliubov-Anderson phonon) shows clear signatures of dimensional crossover both in the one- and two-dimensional limits.",

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Sound velocity and dimensional crossover in a superfluid Fermi gas in an optical lattice

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