Topological phase transitions and quantum Hall effect in the graphene family
Name
PhysRevB.97.165426.pdf
Size
2.04 MB
Format
Adobe PDF
Checksum (MD5)
6bd28e667b924872ad0e68d4a22724b7
Author(s)
Ledwith, P.
Kort-Kamp, W. J. M.
Dalvit, D. A. R.
Ledwith, Patrick J.
Date Issued
April 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Ledwith, P. et al. "Topological phase transitions and quantum Hall effect in the graphene family." Physical Review B 97, 16 (August 2018): 165426 © 2018 American Physical Society
Version
Final published version
Abstract
Monolayer staggered materials of the graphene family present intrinsic spin-orbit coupling and can be driven through several topological phase transitions using external circularly polarized lasers and static electric or magnetic fields. We show how topological features arising from photoinduced phase transitions and the magnetic-field-induced quantum Hall effect coexist in these materials and simultaneously impact their Hall conductivity through their corresponding charge Chern numbers. We also show that the spectral response of the longitudinal conductivity contains signatures of the various phase-transition boundaries, that the transverse conductivity encodes information about the topology of the band structure, and that both present resonant peaks which can be unequivocally associated with one of the four inequivalent Dirac cones present in these materials. This complex optoelectronic response can be probed with straightforward Faraday rotation experiments, allowing the study of the crossroads between quantum Hall physics, spintronics, and valleytronics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
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/PhysRevB.97.165426
