Abstract
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 language | English |
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Pages (from-to) | 133-139 |
Number of pages | 7 |
Journal | Journal of Low Temperature Physics |
Volume | 196 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2019 Jul 15 |
Externally published | Yes |
Keywords
- Bose–Fermi mixture
- Collective excitation
- Dynamic structure factor
- First sound
- Normal state
- Zero sound
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics