Time delayed control of excited state quantum phase transitions in the Lipkin-Meshkov-Glick model
Quantum Physics
2016-01-06 v1 Quantum Gases
Statistical Mechanics
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.
Keywords
Cite
@article{arxiv.1505.02060,
title = {Time delayed control of excited state quantum phase transitions in the Lipkin-Meshkov-Glick model},
author = {Wassilij Kopylov and Tobias Brandes},
journal= {arXiv preprint arXiv:1505.02060},
year = {2016}
}