title: Broken symmetry quantum Hall states in dual-gated ABA trilayer graphene.
abstract: ABA-stacked trilayer graphene is a unique 2D electron system with mirror reflection symmetry and unconventional quantum Hall effect. We present low-temperature transport measurements on dual-gated suspended trilayer graphene in the quantum Hall (QH) regime. We observe QH plateaus at filling factors ν = -8, -2, 2, 6, and 10, which is in agreement with the full-parameter tight binding calculations. In high magnetic fields, odd-integer plateaus are also resolved, indicating almost complete lifting of the 12-fold degeneracy of the lowest Landau level (LL). Under an out-of-plane electric field E(perpendicular), we observe degeneracy breaking and transitions between QH plateaus. Interestingly, depending on its direction, E(perpendicular) selectively breaks the LL degeneracies in the electron-doped or hole-doped regimes. Our results underscore the rich interaction-induced phenomena in trilayer graphene.
authors.affiliation: Department of Physics and Astronomy, University of California, Riverside, Riverside, California 92521, United States.
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Lee
authors.forename: Jairo
authors.initials: J
authors.lastname: Velasco
authors.forename: David
authors.initials: D
authors.lastname: Tran
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: W
authors.initials: W
authors.lastname: Bao
authors.forename: Lei
authors.initials: L
authors.lastname: Jing
authors.forename: Kevin
authors.initials: K
authors.lastname: Myhro
authors.forename: Dmitry
authors.initials: D
authors.lastname: Smirnov
authors.forename: Chun Ning
authors.initials: CN
authors.lastname: Lau
mesh_terms: D004583:Electrons; D006108:Graphite / Q000737:chemistry*; D060526:Magnetic Fields; D011789:Quantum Theory
chemical_list: D006108:Graphite