Hybrid Sound Modes in One-Dimensional Quantum Liquids

K. A. Matveev, A. V. Andreev

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We study sound in a single-channel one-dimensional quantum liquid. In contrast to classical fluids, instead of a single sound mode we find two modes of density oscillations. The speeds at which these two sound modes propagate are nearly equal, with the difference that scales linearly with the small temperature of the system. The two sound modes emerge as hybrids of the first and second sounds, and combine oscillations of both density and entropy of the liquid.

Original languageEnglish
Article number026803
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 10 Jul 2018
Externally publishedYes


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