Robust fractional quantum Hall effect in the N=2 Landau level in bilayer graphene

Georgi Diankov; Chi-Te Liang; François Amet; Patrick Gallagher; Menyoung Lee; Andrew J. Bestwick; Kevin Tharratt; William Coniglio; Jan Jaroszynski; Kenji Watanabe; Takashi Taniguchi; David Goldhaber-Gordon

doi:10.1038/ncomms13908

ジャーナル論文 Robust fractional quantum Hall effect in the N=2 Landau level in bilayer graphene

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Georgi Diankov, Chi-Te Liang, François Amet, Patrick Gallagher, Menyoung Lee, Andrew J. Bestwick, Kevin Tharratt, William Coniglio, Jan Jaroszynski, Kenji Watanabe, Takashi Taniguchi, David Goldhaber-Gordon. Robust fractional quantum Hall effect in the N=2 Landau level in bilayer graphene. Nature Communications. 2016, 7 (1), 13908. https://doi.org/10.1038/ncomms13908

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(abstract)

We report transport measurements of fractional quantum Hall (FQH) states in the N=2 LL in bilayer graphene, a system with spin and valley degrees of freedom in all LLs, and an additional orbital degeneracy in the 8-fold degenerate N=0/N=1 LLs. In contrast with recent observations of particle-hole asymmetry in the N=0/N=1 LLs of bilayer graphene, the FQH states we observe in the N=2 LL are consistent with the composite fermion model: within a LL, they form a complete sequence of particle-hole symmetric states whose relative strength is dependent on their denominators. The FQH states in the N=2 LL display energy gaps of a few Kelvin, comparable to and in some cases larger than those of fractional states in the N=0/N=1 LLs.

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