%0 Journal Article
%T Time delayed control of excited state quantum phase transitions in the Lipkin-Meshkov-Glick model
%A Wassilij Kopylov
%A Tobias Brandes
%J Physics
%D 2015
%I arXiv
%X 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.
%U http://arxiv.org/abs/1505.02060v1