Graβ, T. ; Saha, K. ; Sengupta, K. ; Lewenstein, M. (2011) Quantum phase transition of ultracold bosons in the presence of a non-Abelian synthetic gauge field Physical Review A, 84 (5). 053632_1-053632_9. ISSN 1050-2947
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Official URL: http://pra.aps.org/abstract/PRA/v84/i5/e053632
Related URL: http://dx.doi.org/10.1103/PhysRevA.84.053632
Abstract
We study the Mott phases and the superfluid-insulator transition of two-component ultracold bosons on a square optical lattice in the presence of a non-Abelian synthetic gauge field, which renders a SU(2)-hopping matrix for the bosons. Using a resummed hopping expansion, we calculate the excitation spectra in the Mott insulating phases and demonstrate that the superfluid-insulator phase boundary displays a nonmonotonic dependence on the gauge-field strength. We also compute the momentum distribution of the bosons in the presence of the non-Abelian field and show that they develop peaks at nonzero momenta as the superfluid-insulator transition point is approached from the Mott side. Finally, we study the superfluid phases near the transition and discuss the induced spatial pattern of the superfluid density due to the presence of the non-Abelian gauge potential.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 94370 |
Deposited On: | 05 Sep 2012 09:15 |
Last Modified: | 05 Sep 2012 09:15 |
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