Sinha, S. ; Sengupta, K. (2011) Superfluid-insulator transition of ultracold bosons in an optical lattice in the presence of a synthetic magnetic field Europhysics Letters, 93 (3). p. 30005. ISSN 0295-5075
|
PDF
- Author Version
404kB |
Official URL: http://iopscience.iop.org/0295-5075/93/3/30005
Related URL: http://dx.doi.org/10.1209/0295-5075/93/30005
Abstract
We study the Mott-insulator-superfluid transition of ultracold bosonic atoms in a two-dimensional square optical lattice in the presence of a synthetic magnetic field with p/q (p and q being co-prime integers) flux quanta passing through each lattice plaquette. We show that on approach to the transition from the Mott side, the momentum distribution of the bosons exhibits q precursor peaks within the first magnetic Brillouin zone. We also provide an effective theory for the transition and show that it involves q interacting boson fields. We construct, from a mean-field analysis of this effective theory, the superfluid ground states near the transition and compute, for q=2, 3, both the gapped and the gapless collective modes of these states. We suggest experiments to test our theory.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to EDP Sciences. |
ID Code: | 81683 |
Deposited On: | 07 Feb 2012 06:16 |
Last Modified: | 18 May 2016 23:09 |
Repository Staff Only: item control page