驱动超流体中的猫态：信号形状和切换协议的作用
Cat states in a driven superfluid: role of signal shape and switching protocol
AI总结：
研究通过驱动超流体中的猫态，探讨信号形状和切换协议对超流体行为的影响。
摘要：
我们研究了一个一维Bose-Hubbard模型，其动能被设置为以零时间平均振荡。有效动力学由一个非典型的多体哈密顿量支配，其中仅允许偶次跃迁过程。在临界驱动值下，系统从Mott绝缘体转变为由两个动量相反且非零的准凝聚态构成的超流体的猫态叠加。我们分析了这种非常规基态对系统参数变化的鲁棒性。特别是我们研究了驱动信号的波形和切换协议的影响。了解系统对这些参数变化的敏感性使我们能够评估这种奇特物理行为的鲁棒性。
英文摘要：
We investigate the behavior of a one-dimensional Bose-Hubbard model whose kinetic energy is made to oscillate with zero time-average. The effective dynamics is governed by an atypical many-body Hamiltonian where only even-order hopping processes are allowed. At a critical value of the driving, the system passes from a Mott insulator to a superfluid formed by a cat-like superposition of two quasi-condensates with opposite non-zero momenta. We analyze the robustness of this unconventional ground state against variations of a number of system parameters. In particular we study the effect of the waveform and the switching protocol of the driving signal. Knowledge of the sensitivity of the system to these parameter variations allows us to gauge the robustness of the exotic physical behavior.
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