Dynamics of uniform quantum gases, I: density and current correlations

Bosse, J. ; Pathak, K. N. ; Singh, G. S. (2010) Dynamics of uniform quantum gases, I: density and current correlations Physica A: Statistical Mechanics and its Applications, 389 (3). pp. 408-418. ISSN 0378-4371

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.physa.2009.10.011

Abstract

A unified approach valid for any wavenumber q, frequency ω, and temperature T is presented for uniform ideal quantum gases allowing for a comprehensive study of number density and particle-current density response functions. Exact analytical expressions are obtained for spectral functions in terms of polylogarithms. Also, particle-number and particle-current static susceptibilities are presented which, for fugacity less than unity, additionally involve Kummer functions. The q- and T-dependent transverse-current static susceptibility is used to show explicitly that current correlations are of long range in a Bose-condensed uniform ideal gas but for bosons at T>Tc and for Fermi and Boltzmann gases at all temperatures these correlations are of short range. Contact repulsive interactions for systems of neutral quantum particles are considered within the random phase approximation. The expressions for particle-number and transverse-current susceptibilities are utilized to discuss the existence or nonexistence of superfluidity in the systems under consideration.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Quantum Gases; Density Correlations; Current Correlations; Boson Degeneracy and Superfluidity
ID Code:96126
Deposited On:05 Dec 2012 06:45
Last Modified:05 Dec 2012 06:45

Repository Staff Only: item control page