Energy Gaps and Layer Polarization of Integer and Fractional Quantum Hall States in Bilayer Graphene

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Energy Gaps and Layer Polarization of Integer and Fractional Quantum Hall States in Bilayer Graphene

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Title: Energy Gaps and Layer Polarization of Integer and Fractional Quantum Hall States in Bilayer Graphene
Author(s):
Shi, Yanmeng;
Lee, Yongjin;
Che, Shi;
Pi, Ziqi;
Espiritu, Timothy;
Stepanov, Petr;
Smirnov, Dmitry;
Lau, Chun Ning;
Zhang, Fan (UT Dallas)
Item Type: Article
Keywords: Graphene
Quantum Hall effect
Magnetic fields
Polarization (Nuclear physics)
Description: Includes supplementary material
Abstract: Owing to the spin, valley, and orbital symmetries, the lowest Landau level in bilayer graphene exhibits multicomponent quantum Hall ferromagnetism. Using transport spectroscopy, we investigate the energy gaps of integer and fractional quantum Hall (QH) states in bilayer graphene with controlled layer polarization. The state at filling factor ν=1 has two distinct phases: a layer polarized state that has a larger energy gap and is stabilized by high electric field, and a hitherto unobserved interlayer coherent state with a smaller gap that is stabilized by large magnetic field. In contrast, the ν=2/3 quantum Hall state and a feature at ν=1/2 are only resolved at finite electric field and large magnetic field. These results underscore the importance of controlling layer polarization in understanding the competing symmetries in the unusual QH system of BLG.
Publisher: American Physical Society
ISSN: 1079-7114
Persistent Link: http://hdl.handle.net/10735.1/5066
http://dx.doi.org/10.1103/PhysRevLett.116.056601
Bibliographic Citation: Shi, Yanmeng, Yongjin Lee, Shi Che, Ziqi Pi, et al. 2016. "Energy gaps and layer polarization of integer and fractional quantum hall states in bilayer graphene." Physical Review Letters 116(5), doi:10.1103/PhysRevLett.116.056601
Terms of Use: ©2016 American Physical Society
Sponsors: US Dept of Energy, BES Division under Grant No. ER 46940-DE-SC0010597

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