Nonequilibrium Quantum Criticality and Non-Markovian Environment: Critical Exponent of a Quantum Phase Transition.
Nonequilibrium Quantum Criticality and Non-Markovian Environment: Critical Exponent of a Quantum Phase Transition.
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DOI：
10.1103/physrevlett.115.043601
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发表时间：
2015-07
影响因子：
8.6
通讯作者：
D. Nagy;P. Domokos
中科院分区：
文献类型：
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作者：
D. Nagy;P. Domokos
我们表明，在阻尼驱动的开放系统的量子相变的临界指数是由水库的谱密度函数。我们考虑开放系统的迪凯模型的变体，其中驱动玻色子模式，也大N自旋耦合到独立的水库在零温度。临界指数，这是1，如果没有自旋浴耦合，降低到1以下时，自旋耦合到一个亚欧姆水库。
We show that the critical exponent of a quantum phase transition in a damped-driven open system is determined by the spectral density function of the reservoir. We consider the open-system variant of the Dicke model, where the driven boson mode and also the large N spin couple to independent reservoirs at zero temperature. The critical exponent, which is 1 if there is no spin-bath coupling, decreases below 1 when the spin couples to a sub-Ohmic reservoir.