Broken Symmetry Quantum Hall States in Dual-Gated ABA Trilayer Graphene
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- 作者：Yongjin Lee ; Jairo Velasco ; Jr ; David Tran ; Fan Zhang ; W. Bao ; Lei Jing ; Kevin Myhro ; Dmitry Smirnov ; Chun Ning Lau
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：April 10, 2013
- 年：2013
- 卷：13
- 期：4
- 页码：1627-1631
- 全文大小：317K
- 年卷期：v.13,no.4(April 10, 2013)
- ISSN：1530-6992
文摘
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 谓 = 鈭?, 鈭?, 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, we observe degeneracy breaking and transitions between QH plateaus. Interestingly, depending on its direction, E selectively breaks the LL degeneracies in the electron-doped or hole-doped regimes. Our results underscore the rich interaction-induced phenomena in trilayer graphene.