期刊
NANO LETTERS
卷 13, 期 4, 页码 1627-1631出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl4000757
关键词
Trilayer graphene; quantum Hall effect; broken symmetries; Landau level crossing
类别
资金
- NSF CAREER [DMR/0748910, NSF/1106358]
- FAME Center
- DARPA SPAWAR [N66001-11-1-4110]
- State of Florida
- DOE
- DARPA/DMEA [H94003-10-2-1003]
- [NSF/DMR-0654118]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0748910] Funding Source: National Science Foundation
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 nu = -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 to, we observe degeneracy breaking and transitions between QH plateaus. Interestingly, depending on its direction, E-perpendicular to selectively breaks the LL degeneracies in the electron-doped or hole-doped regimes. Our results underscore the rich interaction-induced phenomena in trilayer graphene.
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