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
影响因子:
2.9
通讯作者:
Brandes, T.
中科院分区:
文献类型:
--
作者:
Engelhardt, G.;Bastidas, V. M.;Brandes, T.
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.