Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene
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PhysRevLett.117.066601.pdf
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Checksum (MD5)
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Author(s)
Campos, Leonardo C.
Taychatanapat, Thiti
Serbyn, Maksym
Surakitbovorn, Kawin
Watanabe, Kenji
Taniguchi, Takashi
Abanin, Dmitry A.
Jarillo-Herrero, Pablo
Date Issued
August 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Campos, Leonardo C.; Taychatanapat, Thiti; Serbyn, Maksym et al." Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene." Physical Review Letters 117, 066601 (August 2016): 1-5 © 2016 American Physical Society
Version
Final published version
Abstract
We report on magnetotransport studies of dual-gated, Bernal-stacked trilayer graphene (TLG) encapsulated in boron nitride crystals. We observe a quantum Hall effect staircase which indicates a complete lifting of the 12-fold degeneracy of the zeroth Landau level. As a function of perpendicular electric field, our data exhibit a sequence of phase transitions between all integer quantum Hall states in the filling factor interval -8<ν<0. We develop a theoretical model and argue that, in contrast to monolayer and bilayer graphene, the observed Landau level splittings and quantum Hall phase transitions can be understood within a single-particle picture, but imply the presence of a charge density imbalance between the inner and outer layers of TLG, even at charge neutrality and zero transverse electric field. Our results indicate the importance of a previously unaccounted band structure parameter which, together with a more accurate estimate of the other tight-binding parameters, results in a significantly improved determination of the electronic and Landau level structure of TLG.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.066601
