Mott physics on helical edges of two-dimensional topological insulators

Youhei Yamaji, Masatoshi Imada

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Abstract

We study roles of electron correlations on topological insulators or quantum spin Hall insulators on honeycomb lattice with spin-orbit interaction. Accurate variational Monte Carlo calculations with a large number of variational parameters show that the increasing on-site Coulomb interactions cause a strong suppression of the charge Drude weight in the helical-edge metallic states leading to a presumable Mott transition (or strong crossover) from a conventional topological insulator to an edge Mott insulator before a transition to a bulk antiferromagnetic insulator. The intermediate bulk-topological and edge-Mott-insulator phase has a helical spin-liquid character with time-reversal symmetry.

Original languageEnglish
Article number205122
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number20
DOIs
Publication statusPublished - 2011 May 20

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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