Measurement of the ν=1/3 Fractional Quantum Hall Energy Gap in Suspended Graphene

Fereshte Ghahari, Yue Zhao, Paul Cadden-Zimansky, Kirill Bolotin, and Philip Kim
Phys. Rev. Lett. 106, 046801 – Published 25 January 2011

Abstract

We report on magnetotransport measurements of multiterminal suspended graphene devices. Fully developed integer quantum Hall states appear in magnetic fields as low as 2 T. At higher fields the formation of longitudinal resistance minima and transverse resistance plateaus are seen corresponding to fractional quantum Hall states, most strongly for ν=1/3. By measuring the temperature dependence of these resistance minima, the energy gap for the 1/3 fractional state in graphene is determined to be at 20K at 14 T.

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  • Received 30 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.046801

© 2011 American Physical Society

Authors & Affiliations

Fereshte Ghahari, Yue Zhao, Paul Cadden-Zimansky, Kirill Bolotin*, and Philip Kim

  • Department of Physics, Columbia University, New York, New York 10027

  • *Present address: Department of Physics, Vanderbilt University, Nashville TN 37212, USA.

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Vol. 106, Iss. 4 — 28 January 2011

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