Second Sound in Systems of One-Dimensional Fermions

K. A. Matveev, A. V. Andreev

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We study sound in Galilean invariant systems of one-dimensional fermions. At low temperatures, we find a broad range of frequencies in which in addition to the waves of density there is a second sound corresponding to the ballistic propagation of heat in the system. The damping of the second sound mode is weak, provided the frequency is large compared to a relaxation rate that is exponentially small at low temperatures. At lower frequencies, the second sound mode is damped, and the propagation of heat is diffusive.

Original languageEnglish
Article number266801
JournalPhysical Review Letters
Issue number26
Publication statusPublished - 27 Dec 2017
Externally publishedYes


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