Geometric Model of Topological Insulators from the Maxwell Algebra

Giandomenico Palumbo

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We propose a novel geometric model of three-dimensional topological insulators in presence of an external electromagnetic field. The gapped boundary of these systems supports relativistic quantum Hall states and is described by a Chern-Simons theory with a gauge connection that takes values in the Maxwell algebra. This represents a non-central extension of the Poincar\'e algebra and takes into account both the Lorentz and magnetic-translation symmetries of the surface states. In this way, we derive a relativistic version of the Wen-Zee term, and we show that the non-minimal coupling between the background geometry and the electromagnetic field in the model is in agreement with the main properties of the relativistic quantum Hall states in the flat space.
Original languageEnglish
Pages (from-to)15-24
JournalAnnals of Physics
Volume386
DOIs
Publication statusPublished - Nov 2017

Keywords

  • Topological insulator
  • Chern–
  • Simons theory
  • Quantum
  • Hall effect
  • Maxwell algebra

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