Broken Symmetry Quantum Hall States in Dual Gated ABA Trilayer Graphene

Yongjin Lee, Jairo Velasco Jr, David Tran, Fan Zhang, Wenzhong Bao, Lei Jing, Kevin Myhro, Dmitry Smirnov, Chun Ning Lau

Published 2012-10-24, updated 2012-10-29Version 2

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, 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 levels (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.