Excited-state quantum phase transitions and periodic dynamics

Excited-state quantum phase transitions and periodic dynamics
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DOI:
10.1103/physreva.91.013631
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发表时间:
2015-01-30
期刊:
影响因子:
2.9
通讯作者:
Brandes, T.
Brandes, T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Engelhardt, G.;Bastidas, V. M.;Brandes, T.

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我们研究了 Lipkin-Meshkov-Glick 模型和 Tavis-Cummings 模型的周期性动力学中激发态量子相变的特征。在热力学极限下,系统本征态的可观测值的期望值可以使用经典轨迹计算。受此启发,我们提出了一种基于有限尺寸系统的时间演化的方法来寻找可观测量中的奇点,这些奇点是由于激发态量子相变而产生的。
We investigate signatures of the excited-state quantum phase transition in the periodic dynamics of the Lipkin-Meshkov-Glick model and the Tavis-Cummings model. In the thermodynamic limit, expectation values of observables in eigenstates of the system can be calculated using classical trajectories. Motivated by this, we suggest a method based on the time evolution of the finite-size system to find singularities in observables, which arise due to the excited-state quantum phase transition.