期刊
SCIENCE
卷 345, 期 6192, 页码 55-57出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1250270
关键词
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资金
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001819]
- Science and Technology Center for Integrated Quantum Materials under NSF [DMR-1231319]
- NSF [ECS-0335765]
- DOE Office of Science Graduate Fellowship Program
- U.S. Department of Defense (National Defense Science and Engineering Graduate Fellowship program)
The nature of fractional quantum Hall (FQH) states is determined by the interplay between the Coulomb interaction and the symmetries of the system. The distinct combination of spin, valley, and orbital degeneracies in bilayer graphene is predicted to produce an unusual and tunable sequence of FQH states. Here, we present local electronic compressibility measurements of the FQH effect in the lowest Landau level of bilayer graphene. We observe incompressible FQH states at filling factors n = 2p + 2/3, with hints of additional states appearing at v = 2p + 3/5, where p = -2, -1, 0, and 1. This sequence breaks particle-hole symmetry and obeys a v -> v + 2 symmetry, which highlights the importance of the orbital degeneracy for many-body states in bilayer graphene.
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