Graphene bilayer structures with superfluid magnetoexcitons
Institute for Single Crystals, National Academy of Sciences of Ukraine, Lenin ave. 60, Kharkov 61001, Ukraine
Nanoscale Research Letters 2012, 7:145 doi:10.1186/1556-276X-7-145Published: 21 February 2012
In this article, we study superfluid behavior of a gas of spatially indirect magnetoexcitons with reference to a system of two graphene layers embedded in a multilayer dielectric structure. The system is considered as an alternative of a double quantum well in a GaAs heterostructure. We determine a range of parameters (interlayer distance, dielectric constant, magnetic field, and gate voltage) where magnetoexciton superfluidity can be achieved. Temperature of superfluid transition is computed. A reduction of critical parameters caused by impurities is evaluated and critical impurity concentration is determined.