Observation of Scaling in the Dynamics of a Strongly Quenched Quantum Gas.
Observation of Scaling in the Dynamics of a Strongly Quenched Quantum Gas.
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DOI：
10.1103/physrevlett.115.245301
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发表时间：
2015-09
影响因子：
8.6
通讯作者：
E. Nicklas;M. Karl;M. Hofer;A. Johnson;W. Muessel;H. Strobel;J. Tomkovivc;T. Gasenzer;M. Oberthaler
中科院分区：
文献类型：
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作者：
E. Nicklas;M. Karl;M. Hofer;A. Johnson;W. Muessel;H. Strobel;J. Tomkovivc;T. Gasenzer;M. Oberthaler
我们报告了在突然淬灭到量子临界点附近后时间演化中缩放的实验观察。该实验系统是一种两成分玻色气体，成分之间具有相干交换，可以对参数进行必要的高水平控制，并获得时间分辨的空间相关函数。理论分析表明，当淬火系统接近临界点时，淬火引入的能量会导致短时演化，表现出交叉，让人想起系统普适性类别中的有限温度临界特性。观察淬灭后的时间演化代表了获取和探测接近量子临界点的实验通用属性的范式转变，并允许以新的方式通过实验对量子多体理论进行基准测试。
We report on the experimental observation of scaling in the time evolution following a sudden quench into the vicinity of a quantum critical point. The experimental system, a two-component Bose gas with coherent exchange between the constituents, allows for the necessary high level of control of parameters as well as the access to time-resolved spatial correlation functions. The theoretical analysis reveals that when quenching the system close to the critical point, the energy introduced by the quench leads to a short-time evolution exhibiting crossover reminiscent of the finite-temperature critical properties in the system's universality class. Observing the time evolution after a quench represents a paradigm shift in accessing and probing experimentally universal properties close to a quantum critical point and allows in a new way benchmarking of quantum many-body theory with experiments.