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Boundaries and Unphysical Fixed Points in Dynamical Quantum Phase Transitions.

08:00 EDT 18th October 2019 | BioPortfolio

Summary of "Boundaries and Unphysical Fixed Points in Dynamical Quantum Phase Transitions."

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.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 160603

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