论文标题
以开放式驱动光晶格系统的类似疤痕模式以浮雕加热引起的玻色凝结
Floquet-heating-induced Bose condensation in a scar-like mode of an open driven optical-lattice system
论文作者
论文摘要
定期驱动的量子系统通过谐振激发而遭受加热。尽管这种浮动加热将通用的孤立系统指向无限温度状态,但驱动的开放系统(耦合到热浴)将接近非平衡稳态。我们表明,在免受浮子加热的模式下,浴室诱导的耗散和受控的浮子加热的相互作用会导致非平衡的bose凝结。特别是,我们在有限范围的光学晶格中考虑了一维(1D)的bose气体,该晶格与第二个原子物种给出的三维热浴薄弱耦合。浴温度$ t $远高于跨界温度,在该温度下,系统的大多数颗粒在基态处形成A(有限尺寸的)Bose冷凝物。但是,当打开强大的局部电势调制(引起系统激发系统)时,在将驱动器与驱动器脱离的状态下形成了非平衡bose冷凝物。我们的预测基于一个微观模型,该模型是在现实的实验条件下使用源自Floquet-Markov理论的动力学方程式求解的。
Periodically driven quantum systems suffer from heating via resonant excitation. While such Floquet heating guides a generic isolated system towards the infinite-temperature state, a driven open system, coupled to a thermal bath, will approach a non-equilibrium steady state. We show that the interplay of bath-induced dissipation and controlled Floquet heating can give rise to non-equilibrium Bose condensation in a mode protected from Floquet heating. In particular, we consider a one-dimensional (1D) Bose gas in an optical lattice of finite extent, which is coupled weakly to a three-dimensional thermal bath given by a second atomic species. The bath temperature $T$ lies well above the crossover temperature, below which the majority of the system's particles form a (finite-size) Bose condensate in the ground state. However, when a strong local potential modulation is switched on, which resonantly excites the system, a non-equilibrium Bose condensate is formed in a state that decouples from the drive. Our predictions, which are based on a microscopic model that is solved using kinetic equations of motion derived from Floquet-Born-Markov theory, can be probed under realistic experimental conditions.