Thermally induced rotons in two-dimensional dilute Bose gases
| dc.creator | Nogueira, Flavio S. | |
| dc.creator | Kleinert, Hagen | |
| dc.date | 2005-03-21 | |
| dc.date | 2006-02-28 | |
| dc.date.accessioned | 2026-07-07T06:37:36Z | |
| dc.date.available | 2026-07-07T06:37:36Z | |
| dc.description | We show that roton-like excitations are thermally induced in a two-dimensional dilute Bose gas as a consequence of the strong phase fluctuations in two dimensions. At low momentum, the roton-like excitations lead for small enough temperatures to an anomalous phonon spectrum with a temperature dependent exponent reminiscent of the Kosterlitz-Thouless transition. Despite the anomalous form of the energy spectrum, it is shown that the corresponding effective theory of vortices describes the usual Kosterlitz-Thouless transition. The possible existence of an anomalous normal state in a small temperature interval is also discussed. | |
| dc.description | 21 pages; 2 figures; v4: version accepted for publication in PRB; in this version Section IV is considerably extended | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0503523 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0503523 | |
| dc.identifier | Phys. Rev. B 73, 104515 (2006) | |
| dc.identifier | doi:10.1103/PhysRevB.73.104515 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/100448 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Thermally induced rotons in two-dimensional dilute Bose gases | |
| dc.type | text |