Time delayed control of excited state quantum phase transitions in the Lipkin-Meshkov-Glick model
arXiv:1505.02060 · doi:10.1088/1367-2630/17/10/103031
Abstract
We investigate the role of dissipation in excited state quantum phase transitions (ESQPT) within the Lipkin-Meshkov-Glick model. Signatures of the ESQPT are directly visible in the complex spectrum of an effective Hamiltonian, whereas they get smeared out in the time-dependence of system observables. In the latter case, we show how delayed feedback control can be used to restore the visibility of the ESQPT signals.
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