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VOLUME 93 (2011) | ISSUE 4 |
PAGE 238
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Influence of disorder on electron-hole pairing in graphene bilayer
D. K. Efimkin+, V. A. Kulbachinskii*, Yu. E. Lozovik
+Institute of Spectroscopy RAS, 142190 Troitsk, Moscow region, Russia *Moscow State University, Department of Physics, 119991 Moscow, Russia Moscow Institute of Physics and Technology, 141700 Moscow, Russia
Abstract
We consider disorder effect on electron-hole
pairing in the system of two graphene monolayers separated by dielectric
barrier. The influence of charged impurities on temperature of phase
transition is studied. In spite of large values of mobility of charge
carriers in graphene disorder can considerably reduce temperature of
electron-hole condensation in weak-coupling regime. The quantum hydrodynamics
of the system is considered and phase stiffness of electron-hole condensate
and temperature of Berezinskii-Kosterlitz-Thouless transition to the
superfluid state are calculated.
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