Field-induced Kosterlitz-Thouless transition in the n=0 Landau level of graphene.
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.
Nomura
Kentaro
K
Department of Physics, Tohoku University, Sendai, 980-8578, Japan.
Ryu
Shinsei
S
Lee
Dung-Hai
DH