论文标题
通用冷却动力学向量子关键点
Universal cooling dynamics toward a quantum critical point
论文作者
论文摘要
我们研究从初始热态将多体量子系统冷却到量子临界点时的绝热性丧失。量化动力学的绝热程度的激发密度可在冷却速度以及冷却方案的初始和最终温度下遵守缩放定律。缩放定律是普遍的，受量子相变的关键指数的约束。这些陈述的有效性在分析上显示了与马尔可夫浴的基塔夫量子线，并认为在相当一般的条件下有效。我们的结果表明，量子临界特性可以在有限温度下动态探测，甚至不改变量子相变的控制参数。
We investigate the loss of adiabaticity when cooling a many-body quantum system from an initial thermal state toward a quantum critical point. The excitation density, which quantifies the degree of adiabaticity of the dynamics, is found to obey scaling laws in the cooling velocity as well as in the initial and final temperatures of the cooling protocol. The scaling laws are universal, governed by the critical exponents of the quantum phase transition. The validity of these statements is shown analytically for a Kitaev quantum wire coupled to Markovian baths and argued to be valid under rather general conditions. Our results establish that quantum critical properties can be probed dynamically at finite temperature, without even varying the control parameter of the quantum phase transition.
