论文标题
跨Berezinskii-Kosterlitz的周期性淬火 - 无与伦比的相变
Periodic quenches across the Berezinskii-Kosterlitz-Thouless phase transition
论文作者
论文摘要
讨论了在BEREZINSKII-KOSTERLITZ-thouless-Thouless（BKT）相变的超速均匀原子二维bose气体的淬火动力学。具体而言，我们通过对随机预测的Gross-Pitaevskii方程的数值模拟，解决了上述热无序状态之间有效原子相互作用强度的周期性循环的影响。从低频到高频驱动正弦的驱动频率的探测动力学揭示了各种动力学特征，包括相位滞留的准绝热可逆凝结物形成，与固有的系统放松时间尺度相一致的共振激发，以及逐渐降低了与动态运行的状态，它们均不置于非平衡状态。我们的研究铺平了对这种驱动的非平衡超低超流体状态的实验观察的道路。
The quenched dynamics of an ultracold homogeneous atomic two-dimensional Bose gas subjected to periodic quenches across the Berezinskii-Kosterlitz-Thouless (BKT) phase transition are discussed. Specifically, we address the effect of periodic cycling of the effective atomic interaction strength between a thermal disordered state above, and a highly ordered state below the critical BKT interaction strength, by means of numerical simulations of the stochastic projected Gross-Pitaevskii equation. Probing the emerging dynamics as a function of the frequency of sinusoidal driving from low to high frequencies reveals diverse dynamical features, including phase-lagged quasi adiabatic reversible condensate formation, resonant excitation consistent with an intrinsic system relaxation timescale, and gradual establishment of dynamically-recurring or time-averaged non-equilibrium states with enhanced coherence which are neither condensed, nor thermal. Our study paves the way for experimental observation of such driven non-equilibrium ultracold superfluid states.
