Collapse of Landau Levels in Gated Graphene Structures
Author(s)Gu, Nan; Rudner, Mark; Young, Andrea; Kim, Philip; Levitov, Leonid
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Gu, Nan et al. "Collapse of Landau Levels in Gated Graphene Structures." Phys. Rev. Lett. 106, 066601 (2011)© 2011 American Physical Society.
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