Rotating Fermi gases in an anharmonic trap |
| |
Authors: | K Howe A RP Lima and A Pelster |
| |
Institution: | 1.Department of Physics,University of Arizona,Tucson,USA;2.Institut für Theoretische Physik, Freie Universit?t Berlin,Berlin,Germany;3.Fachbereich Physik, Universit?t Duisburg-Essen,Duisburg,Germany |
| |
Abstract: | Motivated by recent experiments on rotating Bose-Einstein condensates, we investigate a rotating, polarized Fermi gas trapped
in an anharmonic potential. We apply a semiclassical expansion of the density of states in order to determine how the thermodynamic
properties depend on the rotation frequency. The accuracy of the semiclassical approximation is tested and shown to be sufficient
for describing typical experiments. At zero temperature, rotating the gas above a given frequency ΩDO leads to a ‘donut’-shaped cloud which is analogous to the hole found in two-dimensional Bose-Einstein condensates. The free
expansion of the gas after suddenly turning off the trap is considered and characterized by the time and rotation frequency
dependence of the aspect ratio. Temperature effects are also taken into account and both low- and high-temperature expansions
are presented for the relevant thermodynamical quantities. In the high-temperature regime a virial theorem approach is used
to study the delicate interplay between rotation and anharmonicity. |
| |
Keywords: | PACS" target="_blank">PACS 51 30 +i Thermodynamic properties equations of state 31 15 xg Semiclassical methods 67 85 Lm Degenerate Fermi gases |
本文献已被 SpringerLink 等数据库收录! |
|