Competing orders in the Dirac-like electronic structure and the nonlinear sigma model with a topological term

Pouyan Ghaemi, Shinsei Ryu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The Dirac-like electronic structure can host a large number of competing orders in the form of mass terms. In particular, two different order parameters can be said to be dual to each other, when a static defect in one of them traps a quantum number (or "charge") of the other. We discuss that such complementary nature of the pair of the order parameters shows up in their correlation functions and dynamical properties when a quantum phase transition is driven by fluctuations of the one of the order parameters. Approaching the transition from the disordered (paramagnetic) side, the order parameter correlation function at the critical point is reduced, while such fluctuations enhance the correlation of the dual order parameter. Such complementary behaviors in the correlation function can be used to diagnose the nature of quantum fluctuations that is the driving force of the quantum phase transition.

Original languageEnglish (US)
Article number075111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number7
DOIs
StatePublished - Feb 9 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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