Response functions and superfluid density in a weakly interacting Bose gas with nonquadratic dispersion
- 27 October 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 74 (15), 155325
- https://doi.org/10.1103/physrevb.74.155325
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.Keywords
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