Title | Excitations and correlations in the driven-dissipative Bose-Hubbard model |
Publication Type | Journal Article |
Year of Publication | 2019 |
Authors | T. Grass |
Journal | Phys. Rev. A |
Volume | 99 |
Pagination | 043607 |
Date Published | APR 4 |
Type of Article | Article |
ISSN | 2469-9926 |
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. |
DOI | 10.1103/PhysRevA.99.043607 |