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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-ph2018★ 64 cited
Probing excited-state quantum phase transition in a quantum many body system via out-of-time-ordered correlator
Qian Wang, Francisco Pérez-Bernal
As a measure of information scrambling and quantum chaos, out-of-time-ordered correlator (OTOC) plays more and more important role in many different fields of physics. In this work…