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arXiv 0812.4717cond-mat.stat-mech
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接近量子相变的热化动力学

Thermalization dynamics close to a quantum phase transition

Dario Patanè, Alessandro Silva, Fernando Sols, Luigi Amico

摘要:

研究了与热浴接触的量子临界系统的耗散动力学。与用于分析老化的标准协议类似,我们研究了系统对浴温突然变化的响应。XY模型中的横向磁场的自旋被局部耦合到一组玻色子浴的具体例子被认为是。动力学的特殊性质被编码在从平衡发展出来的相关性中。通过动力学方程分析了自旋-自旋关联和嵌段关联。我们确定了一些普遍的功能,在平衡的动态。出现了两种不同的制度,其特点是时间和长度不同。在初始瞬态的动力学的特征在于相同的临界指数的平衡量子相变和类似的热相变的动力学。在很长一段时间内,通过沿着热锋链的传播达到平衡,其方式类似于经典的Glauber动力学。

英文摘要:

We investigate the dissipative dynamics of a quantum critical system in contact with a thermal bath. In analogy with the standard protocol employed to analyze aging, we study the response of a system to a sudden change of the bath temperature. The specific example of the XY model in a transverse magnetic field whose spins are locally coupled to a set of bosonic baths is considered. The peculiar nature of the dynamics is encoded in the correlations developing out of equilibrium. By means of a kinetic equation we analyze the spin-spin correlations and block correlations. We identify some universal features in the out-of-equilibrium dynamics. Two distinct regimes, characterized by different time and length scales, emerge. During the initial transient the dynamics is characterized by the same critical exponents as those of the equilibrium quantum phase transition and resembles the dynamics of thermal phase transitions. At long times equilibrium is reached through the propagation along the chain of a thermal front in a manner similar to the classical Glauber dynamics.

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