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- W2462805630 abstract "In recent experiments, spin-orbit-coupled (SOC) bosonic gases in an optical lattice have been successfully prepared into any Bloch band [Hamner et al., Phys. Rev. Lett. 114, 070401 (2015)], which promises a viable contender in the competitive field of simulating gauge-related phenomena. However, the ground-state phase diagram of such systems in the superfluid regime is still lacking. Here we present a detailed study of the phase diagram in an optically trapped Bose gas with equal-weight Rashba and Dresselhaus SO coupling. We identify four different quantum phases, which include three normal phases and a mixed phase, by considering the wave vector ${k}_{1}$, the longitudinal $ensuremath{langle}{ensuremath{sigma}}_{z}ensuremath{rangle}$, and the transverse $ensuremath{langle}{ensuremath{sigma}}_{x}ensuremath{rangle}$ spin polarizations as three order parameters. The ground state of normal phases is a Bloch wave with a single wave vector ${k}_{1}$, which can position in arbitrary regions in the Brillouin zone. By contrast, the ground state of the mixed phase is a superposition of two Bloch waves with opposite ${k}_{1}$, which, remarkably, may lack periodicity even though the system's Hamiltonian is periodic. This mixed phase in the lattice setting can be seen as the counterpart of the stripe phase associated with the uniform SOC gas. Furthermore, due to the lattice-renormalized SOC, the phase diagram of the model system becomes significantly different from the uniform case when the lattice strength grows. Finally, a scheme for experimentally probing the mixed phase using Bragg spectroscopy is proposed." @default.
- W2462805630 created "2016-07-22" @default.
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- W2462805630 date "2016-01-05" @default.
- W2462805630 modified "2023-10-17" @default.
- W2462805630 title "Ground-state phase diagram of a spin-orbit-coupled bosonic superfluid in an optical lattice" @default.
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- W2462805630 doi "https://doi.org/10.1103/physreva.93.013601" @default.
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