Collapse of Landau Levels in Gated Graphene Structures
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Gu-2011-Collapse of Landau L.pdf
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Author(s)
Gu, Nan
Rudner, Mark
Young, Andrea
Kim, Philip
Levitov, Leonid
Date Issued
February 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Gu, Nan et al. "Collapse of Landau Levels in Gated Graphene Structures." Phys. Rev. Lett. 106, 066601 (2011)© 2011 American Physical Society.
Version
Final published version
Abstract
We describe a new regime of magnetotransport in two-dimensional electron systems in the presence of a narrow potential barrier. In such systems, the Landau level states, which are confined to the barrier region in strong magnetic fields, undergo a deconfinement transition as the field is lowered. Transport measurements on a top-gated graphene device are presented. Shubnikov–de Haas (SdH) oscillations, observed in the unipolar regime, are found to abruptly disappear when the strength of the magnetic field is reduced below a certain critical value. This behavior is explained by a semiclassical analysis of the transformation of closed cyclotron orbits into open, deconfined trajectories.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.066601
