Discontinuities in the first and second sound velocities at the Berezinskii-Kosterlitz-Thouless transition

Tomoki Ozawa, Sandro Stringari

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We calculate the temperature dependence of the first and second sound velocities in the superfluid phase of a 2D dilute Bose gas by solving Landau's two fluid hydrodynamic equations. We predict the occurrence of a significant discontinuity in both velocities at the critical temperature, as a consequence of the jump of the superfluid density characterizing the Berezinskii-Kosterlitz- Thouless transition. The key role of the thermal expansion coefficient is discussed. We find that second sound in this dilute Bose gas can be easily excited through a density perturbation, thereby, making the perspective of the measurement of the superfluid density particularly favorable.

Original languageEnglish
Article number025302
JournalPhysical review letters
Volume112
Issue number2
DOIs
Publication statusPublished - 2014 Jan 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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