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

Title: Energy Gaps and Layer Polarization of Integer and Fractional Quantum Hall States in Bilayer Graphene.
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Name(s): Shi, Yanmeng, author
Lee, Yongjin, author
Che, Shi, author
Pi, Ziqi, author
Espiritu, Timothy, author
Stepanov, Petr, author
Smirnov, Dmitry, author
Lau, Chun Ning, author
Zhang, Fan, author
Type of Resource: text
Genre: Text
Date Issued: 2016-02-05
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 nu = 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 nu = 2/3 quantum Hall state and a feature at nu = 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.
Identifier: FSU_libsubv1_wos_000369495000015 (IID), 10.1103/PhysRevLett.116.056601 (DOI)
Keywords: broken-symmetry states, insulating states, phase, transport
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1103/PhysRevLett.116.056601
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000369495000015
Host Institution: FSU
Is Part Of: Physical Review Letters.
0031-9007
Issue: iss. 5, vol. 116

Choose the citation style.
Shi, Y., Lee, Y., Che, S., Pi, Z., Espiritu, T., Stepanov, P., … Zhang, F. (2016). Energy Gaps and Layer Polarization of Integer and Fractional Quantum Hall States in Bilayer Graphene. Physical Review Letters. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000369495000015