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• W1554804955 abstract "We consider ultracold bosons in a 2D square optical lattice described by the Bose-Hubbard model. In addition, an external time-dependent sinusoidal force is applied to the system, which shakes the lattice along one of the diagonals. The effect of the shaking is to renormalize the nearest-neighbor hopping coefficients, which can be arbitrarily reduced, can vanish, or can even change sign, depending on the shaking parameter. It is therefore necessary to account for higher-order hopping terms, which are renormalized differently by the shaking, and introduce anisotropy into the problem. We show that the competition between these different hopping terms leads to finite-momentum condensates, with a momentum that may be tuned via the strength of the shaking. We calculate the boundaries between the Mott-insulator and the different superfluid phases, and present the time-of-flight images expected to be observed experimentally. Our results open up new possibilities for the realization of bosonic analogs of the FFLO phase describing inhomogeneous superconductivity." @default.
• W1554804955 created "2016-06-24" @default.
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• W1554804955 date "2011-07-18" @default.
• W1554804955 modified "2023-10-18" @default.
• W1554804955 title "Finite-momentum Bose-Einstein condensates in shaken two-dimensional square optical lattices" @default.
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• W1554804955 doi "https://doi.org/10.1103/physreva.84.013607" @default.
• W1554804955 hasPublicationYear "2011" @default.
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