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Quantum anomalous Hall state from spatially decaying interactions on the decorated honeycomb lattice

Mengsu Chen, Hoi-Yin Hui, Sumanta Tewari, and V. W. Scarola
Phys. Rev. B 97, 035114 – Published 9 January 2018

Abstract

Topological phases typically encode topology at the level of the single-particle band structure. But a remarkable class of models shows that quantum anomalous Hall effects can be driven exclusively by interactions, while the parent noninteracting band structure is topologically trivial. Unfortunately, these models have so far relied on interactions that do not spatially decay and are therefore unphysical. We study a model of spinless fermions on a decorated honeycomb lattice. Using complementary methods, mean-field theory and exact diagonalization, we find a robust quantum anomalous Hall phase arising from spatially decaying interactions. Our finding indicates that the quantum anomalous Hall effect driven entirely by interactions is a surprisingly robust and realistic phenomenon.

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  • Received 22 June 2017
  • Revised 24 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.035114

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mengsu Chen1, Hoi-Yin Hui1, Sumanta Tewari2,3, and V. W. Scarola1

  • 1Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
  • 2Department of Physics, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
  • 3Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA

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Issue

Vol. 97, Iss. 3 — 15 January 2018

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