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Boundaries and Unphysical Fixed Points in Dynamical Quantum Phase Transitions
Published in American Physical Society
PMID: 31702330
Volume: 123
Issue: 16
We show that dynamic quantum phase transitions (DQPT) in many situations involve renormalization group (RG) fixed points that are unphysical in the context of thermal phase transitions. In such cases, boundary conditions are shown to become relevant to the extent of even completely suppressing the bulk transitions. We establish these by performing an exact RG analysis of the quantum Ising model on scale-invariant lattices of different dimensions, and by analyzing the zeros of the Loschmidt amplitude. Further corroboration of boundaries affecting the bulk transition comes from the three-state quantum Potts chain, for which we also show that the DQPT corresponds to a pair of period-2 fixed points. © 2019 American Physical Society.
About the journal
JournalData powered by TypesetPhysical Review Letters
PublisherData powered by TypesetAmerican Physical Society