Polar Kerr Effect and Time Reversal Symmetry Breaking in Bilayer Graphene
Name
Nandkishore-2011-Polar Kerr Effect and Time Reversal Symmetry.pdf
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Author(s)
Nandkishore, Rahul Mahajan
Levitov, Leonid
Date Issued
April 2011
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Nandkishore, Rahul, and Leonid Levitov. “Polar Kerr Effect and Time Reversal Symmetry Breaking in Bilayer Graphene.” Physical Review Letters 107.9 (2011): n. pag. Web. 9 Feb. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
The unique sensitivity of optical response to different types of symmetry breaking can be used to detect and identify spontaneously ordered many-body states in bilayer graphene. We predict a strong response at optical frequencies, sensitive to electronic phenomena at low energies, which arises because of nonzero interband matrix elements of the electric current operator. In particular, the polar Kerr rotation and reflection anisotropy provide fingerprints of the quantum anomalous Hall state and the nematic state, characterized by spontaneously broken time-reversal symmetry and lattice rotation symmetry, respectively. These optical signatures, which undergo a resonant enhancement in the near-infrared regime, lie well within reach of existing experimental techniques.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.097402
