Thursday, November 29, 2012

1211.6562 (Andrea Perali et al.)

High Temperature Superfluidity in Double Bilayer Graphene    [PDF]

Andrea Perali, David Neilson, Alex R. Hamilton
Exciton bound states in solids between electrons and holes are predicted to form a superfluid at high temperatures. We show that by employing atomically thin crystals such as a pair of adjacent bilayer graphene sheets, equilibrium superfluidity of electron-hole pairs should be achievable for the first time. The BCS transition temperatures can be well in excess of liquid nitrogen temperatures. Because the sample parameters needed for the device have already been attained in similar graphene devices, our work suggests a new route towards realizing high-temperature superfluidity in existing quality graphene samples. A single sample should be tunable from BCS as far as the Bose-Einstein condensation crossover simply by varying the carrier densities.
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