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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 21
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Phys. Rev. Lett. 103, 216801 (2009) [4 pages]

Field-Induced Kosterlitz-Thouless Transition in the N=0 Landau Level of Graphene

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Kentaro Nomura1, Shinsei Ryu2, and Dung-Hai Lee2,3
1Department of Physics, Tohoku University, Sendai, 980-8578, Japan
2Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
3Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Received 5 June 2009; published 20 November 2009

At the charge neutral point, graphene exhibits a very unusual high-resistance metallic state and a transition to a complete insulating phase in a strong magnetic field. We propose that the current carriers in this state are the charged vortices of the XY valley-pseudospin order parameter, a situation which is dual to a conventional thin superconducting film. We study energetics and the stability of this phase in the presence of disorder.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.216801
DOI:
10.1103/PhysRevLett.103.216801
PACS:
73.21.−b, 72.10.−d, 73.50.Fq
 
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