Response functions and superfluid density in a weakly interacting Bose gas with non-quadratic dispersion

Details Response functions and superfluid density in a weakly interacting Bose gas with non-quadratic dispersion Response functions and superfluid density in a weakly interacting Bose gas with non-quadratic dispersion

2006-05-19

arxiv.org/abs/cond-mat/0605494v1

Phys. Rev. B 74, 155325 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.74.155325

Motivated by the experimental search for Bose condensation of quasiparticles in semiconductors, the response functions of a weakly interacting Bose gas, with isotropic but non-quadratic dispersion, are considered. Non-quadratic 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.

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