327 citations
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Showing 2020 · quant-phShow all
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quant-ph2020★ 28 cited
Signatures of excited state quantum phase transitions in quantum many body systems: Phase space analysis
Qian Wang, Francisco Pérez-Bernal
Using the Husimi function, we investigate the phase space signatures of the excited state quantum phase transitions (ESQPTs) in the Lipkin and coupled top models. We show that the…
quant-ph2020★ 14 cited
Characterizing the excited-state quantum phase transition via the dynamical and statistical properties of the diagonal entropy
Qian Wang, Francisco Pérez-Bernal
Using the diagonal entropy, we analyze the dynamical signatures of the Lipkin-Meshkov-Glick (LMG) model excited-state quantum phase transition (ESQPT). We first show that the time…