Negative group velocity and Kelvin-like wake pattern

Eugene B. Kolomeisky, Jonathan Colen, Joseph P. Straley

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Wake patterns due to a uniformly traveling source are a result of the resonant emission of the medium's collective excitations. When there exists a frequency range where such excitations possess a negative group velocity, their interference leads to a wake pattern resembling the Kelvin ship wake: while there are "transverse"and "divergent"wave fronts trailing the source, they are oriented oppositely to Kelvin's. This is illustrated by an explicit calculation of "roton"wake patterns in superfluid He4 where a Kelvin-like wake emerges when the speed of the source marginally exceeds the Landau critical roton velocity.

Original languageEnglish
Article number054509
JournalPhysical Review B
Issue number5
StatePublished - Feb 1 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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