Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-08-12
Phys. Rev. A 84, 053632 (2011)
Physics
Condensed Matter
Quantum Gases
10 pages, 9 figures
Scientific paper
10.1103/PhysRevA.84.053632
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 non-monotonic 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 non-zero 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.
Grass Tobias
Lewenstein Maciej
Saha Kamal Krishna
Sengupta Kausik
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