Collective Excitations in Bose–Fermi Mixtures

Yoji Asano, Masato Narushima, Shohei Watabe, Tetsuro Nikuni

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates from that of the hydrodynamic sound mode. Even at a temperature much lower than the Fermi temperature, the collective mode frequency does not reach the collisionless limit analogous to zero sound in a Fermi gas, because of collisions between bosons and fermions.

Original languageEnglish
Pages (from-to)133-139
Number of pages7
JournalJournal of Low Temperature Physics
Issue number1-2
Publication statusPublished - 2019 Jul 15
Externally publishedYes


  • Bose–Fermi mixture
  • Collective excitation
  • Dynamic structure factor
  • First sound
  • Normal state
  • Zero sound

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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