Response functions and superfluid density in a weakly interacting Bose gas with nonquadratic dispersion
Abstract
Motivated by the experimental search for Bose condensation of quasiparticles in semiconductors, the response functions of a weakly interacting Bose gas, with isotropic but nonquadratic dispersion, are considered. Nonquadratic dispersion modifies the definition of particle current, and leads to modified sum rules for the current-current response function. The effect of these modifications on the Berezhinski-Kosterlitz-Thouless transition is discussed.
- Publication:
-
Physical Review B
- Pub Date:
- October 2006
- DOI:
- arXiv:
- arXiv:cond-mat/0605494
- Bibcode:
- 2006PhRvB..74o5325K
- Keywords:
-
- 03.75.Hh;
- 47.37.+q;
- 71.35.Lk;
- 31.15.Lc;
- Static properties of condensates;
- thermodynamical statistical and structural properties;
- Hydrodynamic aspects of superfluidity;
- quantum fluids;
- Collective effects;
- Quasiparticle methods;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- 4 pages, 2 figures