Mott Physics on Helical Edges of 2D Topological Insulators

Details Mott Physics on Helical Edges of 2D Topological Insulators Mott Physics on Helical Edges of 2D Topological Insulators

2010-12-13

arxiv.org/abs/1012.2637v1

Phys. Rev. B 83, 205122 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.205122

We study roles of electron correlations on topological insulators on the honeycomb lattice with the spin-orbit interaction. Accurate variational Monte Carlo calculations 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 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 the protected time-reversal symmetry.

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