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Collapse of Landau Levels in Gated Graphene Structures

Nan Gu, Mark Rudner, Andrea Young, Philip Kim, and Leonid Levitov
Phys. Rev. Lett. 106, 066601 – Published 9 February 2011
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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.

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  • Received 11 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.066601

© 2011 American Physical Society

Authors & Affiliations

Nan Gu1, Mark Rudner2, Andrea Young3, Philip Kim3, and Leonid Levitov1

  • 1Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, USA
  • 2Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
  • 3Department of Physics, Columbia University, New York, New York 10027, USA

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Issue

Vol. 106, Iss. 6 — 11 February 2011

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