Phase transition kinetics for a Bose Einstein condensate in a periodically driven band system
Phase transition kinetics for a Bose Einstein condensate in a periodically driven band system
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周期性驱动带系统中玻色爱因斯坦凝聚体的相变动力学
DOI：
10.1088/1367-2630/aabc3f
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发表时间：
2017
影响因子：
3.3
通讯作者：
D. Guéry
中科院分区：
文献类型：
--
作者：
E. Michon;C. Cabrera;A. Fortun;M. Berger;M. Arnal;V. Brunaud;J. Billy;C. Petitjean;P. Schlagheck;D. Guéry
利用一维相位调制光晶格实验研究了原子玻色-爱因斯坦凝聚体从空间周期态到波函数符号交替的交错态的动力学跃迁。我们观察到交叉从量子热涨落的触发机制的交错态的成核。在良好的定量协议与数值模拟的基础上截断Wigner方法，我们实验研究的成核时间如何随重整化隧穿率，原子密度，和驱动频率。驱动晶格中的有效反转能带被确定为解释数值计算中观察到的间隙孤子的出现和实验报道的从带间激发成核交错态的可能性的关键成分。
The dynamical transition of an atomic Bose–Einstein condensate from a spatially periodic state to a staggered state with alternating sign in its wavefunction is experimentally studied using a one-dimensional phase modulated optical lattice. We observe the crossover from quantum to thermal fluctuations as the triggering mechanism for the nucleation of staggered states. In good quantitative agreement with numerical simulations based on the truncated Wigner method, we experimentally investigate how the nucleation time varies with the renormalized tunneling rate, the atomic density, and the driving frequency. The effective inverted energy band in the driven lattice is identified as the key ingredient which explains the emergence of gap solitons as observed in numerics and the possibility to nucleate staggered states from interband excitations as reported experimentally.
影响因子：
19.6
作者：
Aidelsburger, M.;Lohse, M.;Goldman, N.
通讯作者：
Goldman, N.