Quantum Hall effect and Landau-level crossing of Dirac fermions in trilayer graphene
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jarillo quantum hall paper.pdf
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Author(s)
Taychatanapat, Thiti
Watanabe, Kenji
Taniguchi, Takashi
Jarillo-Herrero, Pablo
Date Issued
June 2011
Journal
Nature Physics
Publisher
Nature Publishing Group
Citation
Taychatanapat, Thiti, Kenji Watanabe, Takashi Taniguchi, and Pablo Jarillo-Herrero. Quantum Hall Effect and Landau-level Crossing of Dirac Fermions in Trilayer Graphene. Nature Physics 7, no. 8 (June 12, 2011): 621-625.
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Author's final manuscript
Abstract
The physics of Dirac fermions in condensed-matter systems has received extraordinary attention following the discoveries of two new types of quantum Hall effect in single-layer and bilayer graphene1, 2, 3. The electronic structure of trilayer graphene (TLG) has been predicted to consist of both massless single-layer-graphene-like and massive bilayer-graphene-like Dirac subbands4, 5, 6, 7, which should result in new types of mesoscopic and quantum Hall phenomena. However, the low mobility exhibited by TLG devices on conventional substrates has led to few experimental studies8, 9. Here we investigate electronic transport in high-mobility (>100,000 cm[superscript 2] V[superscript −1] s[superscript −1]) TLG devices on hexagonal boron nitride, which enables the observation of Shubnikov–de Haas oscillations and an unconventional quantum Hall effect. The massless and massive characters of the TLG subbands lead to a set of Landau-level crossings, whose magnetic-field and filling-factor coordinates enable the determination of the Slonczewski–Weiss–McClure (SWMcC) parameters10 used to describe the peculiar electronic structure of TLG. Moreover, at high magnetic fields, the degenerate crossing points split into manifolds, indicating the existence of broken-symmetry quantum Hall states.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/nphys2008
