Electron Interactions and Gap Opening in Graphene Superlattices
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Song-2013-Electron interactions and.pdf
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Author(s)
Shytov, Andrey
Levitov, Leonid
Song, Justin Chien Wen
Date Issued
December 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Song, Justin, Andrey Shytov, and Leonid Levitov. “Electron Interactions and Gap Opening in Graphene Superlattices.” Physical Review Letters 111, no. 26 (December 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We develop a theory of interaction effects in graphene superlattices, where tunable superlattice periodicity can be used as a knob to control the gap at the Dirac point. Applied to graphene on hexa-boron-nitride (G/h-BN), our theory predicts substantial many-body enhancement of this gap. Tunable by the moiré superlattice periodicity, a few orders of magnitude enhancement is reachable under optimal conditions. The Dirac point gap enhancement can be much larger than that of the minigaps opened by Bragg scattering at principal superlattice harmonics. This naturally explains the conundrum of large Dirac point gaps recently observed in G/h-BN heterostructures and their tunability by the G/h-BN twist angle.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.266801
