We discuss finite-temperature damping of rotons in elongated Bose-condensed dipolar gases, which are in the Thomas-Fermi regime in the tightly confined directions. The presence of many branches of excitations, which can participate in the damping process, is crucial for the Landau damping and results in significant increase of the damping rate. It is found, however, that even rotons with energies close to the roton gap may remain fairly stable in systems with the roton gap as small as 1 nK .
Physical Review A
- Pub Date:
- July 2022
- Condensed Matter - Quantum Gases;
- Condensed Matter - Strongly Correlated Electrons
- 8 pages, 4 figures, results of numerical calculations are added