Topological classification of dynamical phase transitions

Szabolcs Vajna, B. Dóra

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

We study the nonequilibrium time evolution of a variety of one-dimensional (1D) and two-dimensional (2D) systems (including SSH model, Kitaev-chain, Haldane model, p+ip superconductor, etc.) following a sudden quench. We prove analytically that topology-changing quenches are always followed by nonanalytical temporal behavior of return rates (logarithm of the Loschmidt echo), referred to as dynamical phase transitions (DPTs) in the literature. Similarly to edge states in topological insulators, DPTs can be classified as being topologically protected or not. In 1D systems the number of topologically protected nonequilibrium time scales are determined by the difference between the initial and final winding numbers, while in 2D systems no such relation exists for the Chern numbers. The singularities of dynamical free energy in the 2D case are qualitatively different from those of the 1D case; the cusps appear only in the first time derivative.

Original languageEnglish
Article number155127
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number15
DOIs
Publication statusPublished - Apr 17 2015

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Phase transitions
logarithms
cusps
Superconducting materials
Free energy
echoes
topology
free energy
Topology
insulators
Derivatives

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Topological classification of dynamical phase transitions. / Vajna, Szabolcs; Dóra, B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 15, 155127, 17.04.2015.

Research output: Contribution to journalArticle

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