论文标题
猫状态在驱动的超流体中：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
论文作者
论文摘要
我们研究了一维玻色模型的行为，该模型的动能是用零时间平均振荡的。有效的动态受非典型多体哈密顿式的控制，在那里只允许均匀的跳跃过程。在驱动器的临界值下，系统从莫特绝缘子传递到由两个准分子的猫样叠加形成的超流体，具有相反的非零矩。我们分析了这种非常规基础状态的鲁棒性，以针对许多系统参数的变化。特别是我们研究了波形的效果和驱动信号的开关方案。了解系统对这些参数变化的敏感性的知识使我们能够衡量外来身体行为的鲁棒性。
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.
