Ground-state phase diagram of a spin-orbit-coupled bosonic superfluid in an optical lattice
Chen, Zhu; Liang, Zhaoxin;;
Source PublicationPHYSICAL REVIEW A
AbstractIn 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 , and the transverse 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.
description.department[chen, zhu] inst appl phys & computat math, natl key lab sci & technol computat phys, pob 8009, beijing 100088, peoples r china ; [liang, zhaoxin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
Funding OrganizationNSFC of China [11404026, 11274315]; Youth Innovation Promotion Association CAS [2013125]
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WOS IDWOS:000367658700003
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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Chen, Zhu,Liang, Zhaoxin,,et al. Ground-state phase diagram of a spin-orbit-coupled bosonic superfluid in an optical lattice[J]. PHYSICAL REVIEW A,2016,93(1):-.
APA Chen, Zhu,Liang, Zhaoxin,,& phase diagram of a spin-orbit-coupled bosonic superfluid in an optical lattice.PHYSICAL REVIEW A,93(1),-.
MLA Chen, Zhu,et al."Ground-state phase diagram of a spin-orbit-coupled bosonic superfluid in an optical lattice".PHYSICAL REVIEW A 93.1(2016):-.
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