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

Research output: Contribution to journalArticleScientificpeer-review

26 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 languageEnglish
Article number033620
Pages (from-to)1-8
Number of pages8
JournalPhysical Review A
Volume73
Issue number3
DOIs
Publication statusPublished - Mar 2006
MoE publication typeA1 Journal article-refereed

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