Nonadiabatic dynamics of the excited states for the Lipkin-Meshkov-Glick model

Physical Review. E
Wassilij KopylovT Brandes

Abstract

We theoretically investigate the impact of the excited state quantum phase transition on the adiabatic dynamics for the Lipkin-Meshkov-Glick model. Using a time-dependent protocol, we continuously change a model parameter and then discuss the scaling properties of the system especially close to the excited state quantum phase transition where we find that these depend on the energy eigenstate. On top, we show that the mean-field dynamics with the time-dependent protocol gives the correct scaling and expectation values in the thermodynamic limit even for the excited states.

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Citations

Sep 14, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jia BaoBin Guo

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