Kibble-Zurek dynamics in a trapped ultracold Bose gas

Kibble-Zurek dynamics in a trapped ultracold Bose gas
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被捕获的超冷玻色气体中的基布尔-祖雷克动力学

DOI:
10.1103/physrevresearch.2.033183
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发表时间:
2020
影响因子:
4.2
通讯作者:
N. Proukakis
N. Proukakis
中科院分区:
--
文献类型:
--
作者:
I;J. Dziarmaga;S. Gou;F. Dalfovo;N. Proukakis

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在最近的各向异性谐波陷阱实验的前提下,对通过玻色-爱因斯坦凝聚相变以不同可控速率淬灭的不均匀超冷原子气体的动力学演化进行了数值研究。我们基于随机(投影)Gross-Pitaevskii 方程的研究结果表明,早期与齐次 Kibble-Zurek 机制的预测是一致的。这是通过根据淬火系统感受到的临界距离的适当表征,瓦解不同淬火速率的密度、光谱函数和相关长度的早期动态演化来证明的。通过观察密度波前演化的行为和相应的相序动力学,还研究了超出已识别的动力学临界区域的后续长期演化。
The dynamical evolution of an inhomogeneous ultracold atomic gas quenched at different controllable rates through the Bose-Einstein condensation phase transition is studied numerically in the premise of a recent experiment in an anisotropic harmonic trap. Our findings based on the stochastic (projected) Gross-Pitaevskii equation are shown to be consistent at early times with the predictions of the homogeneous Kibble-Zurek mechanism. This is demonstrated by collapsing the early dynamical evolution of densities, spectral functions and correlation lengths for different quench rates, based on an appropriate characterization of the distance to criticality felt by the quenched system. The subsequent long-time evolution, beyond the identified dynamical critical region, is also investigated by looking at the behaviour of the density wavefront evolution and the corresponding phase ordering dynamics.
DOI: 10.1142/p817
发表时间: 2013-04
期刊: --
影响因子: --
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