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Ultracold gases in presence of time-dependent synthetic gauge field

机译:在存在时间依赖性合成规范领域的超薄气体

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We analyze the effect of a time-dependent synthetic magnetic field on the Mott-Insulating (MI) to superfluid (SF) phase transition of a system of bosons via a site decoupling mean-field approach. The synthetic field is incorporated through Peierls coupling that induces a phase shift in the hopping matrix of the Bose-Hubbard model (BHM). We observe that the behavior of critical hopping strength, J(c), vary differently for different time-dependent synthetic fields. The Mott insulating lobe either stabilizes or contracts depending on the nature of the tuning of the time-dependent synthetic field. Also the inclusion of time in the synthetic field destroys the lattice periodicity, however with proper tuning of the time variation of the gauge field, the periodicity can be restored back. Hence the periodicity of the one-dimensional superfluid order parameter is very sensitive to the variation of the time-dependent field. Further, the order parameter either becomes site dependent or independent depending on the nature of the tuning of the these fields. The time-dependent synthetic magnetic field also induces an asymmetry in the discrete energy spectrum of the system which is also clear from the vanishing 'Butterfly' pattern of the single particle energy spectrum.
机译:我们通过站点去耦平均场方法分析时间依赖性合成磁场对玻子系统系统的超流(SF)相变的影响。通过Peierls耦合结合了合成磁场,其在Bose-Hubbard模型(BHM)的跳跃矩阵中引起相移。我们观察到临界跳跃强度j(c)的行为,不同时间依赖性合成领域不同。根据时间依赖性合成领域的调整的性质,Mott绝缘凸瓣稳定或收缩。此外,在合成场中包含时间破坏了晶格周期性,然而,通过正确调整计量场的时间变化,可以恢复周期性。因此,一维超流顺序参数的周期性对时间依赖性字段的变化非常敏感。此外,订单参数要么取决于站点或独立,具体取决于这些字段的调谐的性质。时间依赖性合成磁场也引起了系统的离散能谱中的不对称,这也是从单粒度能谱的消失的“蝶形”图案中的清晰。

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