Quantum criticality and dynamical instability in the kicked-top model.
Quantum criticality and dynamical instability in the kicked-top model.
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DOI：
10.1103/physrevlett.112.140408
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发表时间：
2013-08
影响因子：
8.6
通讯作者：
V. Bastidas;P. Pérez‐Fernández;M. Vogl;T. Brandes
中科院分区：
文献类型：
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作者：
V. Bastidas;P. Pérez‐Fernández;M. Vogl;T. Brandes
我们研究了由于踢顶的动态不稳定性而导致的准能谱中关键行为的前兆。使用半经典方法，我们分析地获得了态密度的对数散度，这类似于非驱动系统中的连续激发态量子相变。我们提出了一个协议来观察接近临界准能量的磁化尖点行为。
We investigate precursors of critical behavior in the quasienergy spectrum due to the dynamical instability in the kicked top. Using a semiclassical approach, we analytically obtain a logarithmic divergence in the density of states, which is analogous to a continuous excited state quantum phase transition in undriven systems. We propose a protocol to observe the cusp behavior of the magnetization close to the critical quasienergy.