• 文献标题:   Landau Level Splittings, Phase Transitions, and Nonuniform Charge Distribution in Trilayer Graphene
  • 文献类型:   Article
  • 作  者:   CAMPOS LC, TAYCHATANAPAT T, SERBYN M, SURAKITBOVORN K, WATANABE K, TANIGUCHI T, ABANIN DA, JARILLOHERRERO P
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   MIT
  • 被引频次:   12
  • DOI:   10.1103/PhysRevLett.117.066601
  • 出版年:   2016

▎ 摘  要

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 < nu < 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.