Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene

Leonardo C. Campos, Thiti Taychatanapat, Maksym Serbyn, Kawin Surakitbovorn, Kenji Watanabe, Takashi Taniguchi, Dmitry A. Abanin, Pablo Jarillo-Herrero

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28 Scopus citations


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.

Original languageEnglish (US)
Article number066601
JournalPhysical review letters
Issue number6
StatePublished - Aug 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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