Dynamical phase transition in the open Dicke model
Dynamical phase transition in the open Dicke model
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DOI：
10.1073/pnas.1417132112
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发表时间：
2015-03-17
影响因子：
11.1
通讯作者：
Hemmerich, Andreas
中科院分区：
文献类型：
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作者：
Klinder, Jens;Kessler, Hans;Hemmerich, Andreas
通过将玻色-爱因斯坦凝聚体耦合到超窄带宽的光腔中，实现了具有弱耗散通道的迪凯模型。我们探索的动力学临界性质的Hepp-Lieb-迪凯相变通过执行淬火跨越相边界。我们观察到的滞后在一个均匀的阶段和自组织的集体阶段之间的过渡与封闭的循环面积示出幂律缩放相对于淬火时间，这表明在一个一般的框架内介绍了Kibble和Zurek的解释。通过数值求解由广义迪凯汉密尔顿量导出的平均场方程，可以很好地再现观察到的滞后动力学。我们的工作促进了对具有无限程相互作用的开放多体系统中的非平衡物理的理解。
The Dicke model with a weak dissipation channel is realized by coupling a Bose-Einstein condensate to an optical cavity with ultranarrow bandwidth. We explore the dynamical critical properties of the Hepp-Lieb-Dicke phase transition by performing quenches across the phase boundary. We observe hysteresis in the transition between a homogeneous phase and a self-organized collective phase with an enclosed loop area showing power-law scaling with respect to the quench time, which suggests an interpretation within a general framework introduced by Kibble and Zurek. The observed hysteretic dynamics is well reproduced by numerically solving the mean-field equation derived from a generalized Dicke Hamiltonian. Our work promotes the understanding of nonequilibrium physics in open many-body systems with infinite range interactions.