2022
DOI: 10.48550/arxiv.2205.11199
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Dynamical and excited-state quantum phase transitions in collective systems

Ángel L. Corps,
Armando Relaño

Abstract: We study dynamical phase transitions (DPTs) in quantum many-body systems with infinite-range interaction, and present a theory connecting the two kinds of known DPTs (sometimes referred to as DPTs-I and DPTs-II) with the concept of excited-state quantum phase transition (ESQPT), traditionally found in collective models. We show that DPTs-I appear as a manifestation of symmetry restoration after a quench from the broken-symmetry phase, the limits between these two phases being demarcated precisely by an ESQPT. … Show more

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