Mott physics on helical edges of two-dimensional topological insulators

Youhei Yamaji and Masatoshi Imada
Phys. Rev. B 83, 205122 – Published 20 May 2011

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.

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  • Received 13 December 2010

DOI:https://doi.org/10.1103/PhysRevB.83.205122

©2011 American Physical Society

Authors & Affiliations

Youhei Yamaji* and Masatoshi Imada

  • Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan and JST-CREST, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

  • *yamaji@solis.t.u-tokyo.ac.jp

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Issue

Vol. 83, Iss. 20 — 15 May 2011

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