Excitations and correlations in the driven-dissipative Bose-Hubbard model
Quantum Gases
2019-04-10 v1
Abstract
Using a field-theoretic approach within the Schwinger-Keldysh formalism, we study a Bose-Hubbard model in the presence of a driving field and dissipation due to one-body losses. We recover the bistability diagram from the Gross-Pitaevski equation and analyze the different phases with respect to their elementary excitations and correlations. We find the low-density solution to be subdivided into a dynamically instable, a gapped, and a gapless regime. The correlations decay exponentially, but a substantial increase of correlation length marks the regime of gapless excitations.
Cite
@article{arxiv.1901.10424,
title = {Excitations and correlations in the driven-dissipative Bose-Hubbard model},
author = {Tobias Graß},
journal= {arXiv preprint arXiv:1901.10424},
year = {2019}
}
Comments
7 pages, 6 figures