Simple theoretical tools for low dimension Bose gases
Abstract
We first consider an exactly solvable classical field model to understand the coherence properties and the density fluctuations of a one-dimensional (1D) weakly interacting degenerate Bose gas with repulsive interactions at temperatures larger than the chemical potential. In a second part, using a lattice model for the quantum field, we explain how to carefully generalize the usual Bogoliubov approach to study a degenerate and weakly interacting Bose gas in 1D, 2D or 3D in the regime of weak density fluctuations. In the last part, using the mapping to an ideal Fermi gas in second quantized formalism, we calculate and discuss physically the density fluctuations and the coherence properties of a gas of impenetrable bosons in 1D.
Cite
@article{arxiv.cond-mat/0407118,
title = {Simple theoretical tools for low dimension Bose gases},
author = {Yvan Castin},
journal= {arXiv preprint arXiv:cond-mat/0407118},
year = {2016}
}
Comments
lecture notes of Les Houches school on low dimensional quantum gases (April 2003), M. Olshanii, H. Perrin, L. Pricoupenko, Eds ; updated reference [54] and section 3.3