Landau level diagram and the continuous rotational symmetry breaking in trilayer graphene.
Sequence of the zeroth Landau levels (LLs) between filling factors ($\nu$) -6 to 6 in ABA-stacked trilayer graphene (TLG) is ambiguous because it depends sensitively on the non-uniform charge distribution on the three layers of ABA-TLG. Using the sensitivity of quantum Hall (QH) data on the electric field (\textit{E}$^\perp$) and magnetic field (\textit{B}), in an ultraclean ABA-stacked TLG sample, we quantitatively estimate the non-uniformity of the electric field and determine the sequence of the zeroth LLs. We also observe anticrossings between some LLs differing by 3 in LL index, which result from the breaking of the continuous rotational to \textit{C}$_3$ symmetry by the trigonal warping. Finally, we report the observation of a few fractional quantum Hall (FQH) states at low magnetic field.
Publisher URL: http://arxiv.org/abs/1802.05691
DOI: arXiv:1802.05691v2
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