Observation of Many-Body Quantum Phase Transitions beyond the Kibble-Zurek Mechanism.
Observation of Many-Body Quantum Phase Transitions beyond the Kibble-Zurek Mechanism.
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超越Kibble-Zurek机制的多体量子相变的观测。
DOI：
10.1103/physrevlett.127.200601
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发表时间：
2020-12
影响因子：
8.6
通讯作者：
Qi Huang;R. Yao;Libo Liang;Shuai Wang;Qinpei Zheng;Dingping Li;W. Xiong;Xiaoji Zhou;Wenlan Chen;Xuzong Chen;Jiazhong Hu
中科院分区：
文献类型：
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作者：
Qi Huang;R. Yao;Libo Liang;Shuai Wang;Qinpei Zheng;Dingping Li;W. Xiong;Xiaoji Zhou;Wenlan Chen;Xuzong Chen;Jiazhong Hu
多体相变的量子临界行为是量子物理中最吸引人也是最具挑战性的问题之一。本文改进了能带映射方法，研究了从超流到Mott绝缘体的量子相变，观察到了在动力学稳态弛豫区和相位振荡区的临界行为.基于不同的观测量，观察到两个不同的值相同的量子临界参数。这一结果超出了被称为Kibble-Zurek机制的量子相变的普适标度律描述，并表明多个量子临界机制在非均匀系统中的多体量子相变实验中相互竞争。
Quantum critical behavior of many-body phase transitions is one of the most fascinating yet challenging questions in quantum physics. Here, we improved the band-mapping method to investigate the quantum phase transition from superfluid to Mott insulators, and we observed the critical behaviors of quantum phase transitions in both the dynamical steady-state-relaxation region and the phase-oscillation region. Based on various observables, two different values for the same quantum critical parameter are observed. This result is beyond a universal-scaling-law description of quantum phase transitions known as the Kibble-Zurek mechanism, and suggests that multiple quantum critical mechanisms are competing in many-body quantum phase transition experiments in inhomogeneous systems.