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Title: Engineering the quantum anomalous Hall effect in graphene with uniaxial strains

Abstract

We theoretically investigate the manipulation of the quantum anomalous Hall effect (QAHE) in graphene by means of the uniaxial strain. The values of Chern number and Hall conductance demonstrate that the strained graphene in presence of Rashba spin-orbit coupling and exchange field, for vanishing intrinsic spin-orbit coupling, possesses non-trivial topological phase, which is robust against the direction and modulus of the strain. Besides, we also find that the interplay between Rashba and intrinsic spin-orbit couplings results in a topological phase transition in the strained graphene. Remarkably, as the strain strength is increased beyond approximately 7%, the critical parameters of the exchange field for triggering the quantum anomalous Hall phase transition show distinct behaviors—decrease (increase) for strains along zigzag (armchair) direction. Our findings open up a new platform for manipulation of the QAHE by an experimentally accessible strain deformation of the graphene structure, with promising application on novel quantum electronic devices with high efficiency.

Authors:
 [1];  [1]
  1. Institute of Physics, University of Brasília, 70919-970 Brasília-DF (Brazil)
Publication Date:
OSTI Identifier:
22267794
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 114; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DEFORMATION; ENGINEERING; GRAPHENE; HALL EFFECT; HIGH ROOMS; L-S COUPLING; PHASE TRANSFORMATIONS; QUANTUM ELECTRONICS; STRAINS

Citation Formats

Diniz, G. S., E-mail: ginetom@gmail.com, Guassi, M. R., Qu, F., and Department of Physics, The University of Texas at Austin, Austin, Texas 78712. Engineering the quantum anomalous Hall effect in graphene with uniaxial strains. United States: N. p., 2013. Web. doi:10.1063/1.4854415.
Diniz, G. S., E-mail: ginetom@gmail.com, Guassi, M. R., Qu, F., & Department of Physics, The University of Texas at Austin, Austin, Texas 78712. Engineering the quantum anomalous Hall effect in graphene with uniaxial strains. United States. doi:10.1063/1.4854415.
Diniz, G. S., E-mail: ginetom@gmail.com, Guassi, M. R., Qu, F., and Department of Physics, The University of Texas at Austin, Austin, Texas 78712. Sat . "Engineering the quantum anomalous Hall effect in graphene with uniaxial strains". United States. doi:10.1063/1.4854415.
@article{osti_22267794,
title = {Engineering the quantum anomalous Hall effect in graphene with uniaxial strains},
author = {Diniz, G. S., E-mail: ginetom@gmail.com and Guassi, M. R. and Qu, F. and Department of Physics, The University of Texas at Austin, Austin, Texas 78712},
abstractNote = {We theoretically investigate the manipulation of the quantum anomalous Hall effect (QAHE) in graphene by means of the uniaxial strain. The values of Chern number and Hall conductance demonstrate that the strained graphene in presence of Rashba spin-orbit coupling and exchange field, for vanishing intrinsic spin-orbit coupling, possesses non-trivial topological phase, which is robust against the direction and modulus of the strain. Besides, we also find that the interplay between Rashba and intrinsic spin-orbit couplings results in a topological phase transition in the strained graphene. Remarkably, as the strain strength is increased beyond approximately 7%, the critical parameters of the exchange field for triggering the quantum anomalous Hall phase transition show distinct behaviors—decrease (increase) for strains along zigzag (armchair) direction. Our findings open up a new platform for manipulation of the QAHE by an experimentally accessible strain deformation of the graphene structure, with promising application on novel quantum electronic devices with high efficiency.},
doi = {10.1063/1.4854415},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 24,
volume = 114,
place = {United States},
year = {2013},
month = {12}
}