Superfluidity Of Dipolar Excitons In Doped Double-Layered Hexagonal Lattice In A Strong Magnetic Field

We examine the occurrence of Bose-Einstein condensation and superfluidity of dipolar excitons for a pair of quasi-two-dimensional spatially separated hexagonal alpha-T-3 layers. In the alpha-T-3 model, the AB-honeycomb lattice structure is supplemented with C atoms, located at the centers of the hexagonal lattice. We have solved a two-body problem for an electron and a hole for the model Hamiltonian for the alpha-T-3 double layer in a magnetic field. The exciton binding energy is changed due to the magnetic field, and magnetoexcitons are formed as excitons in a magnetic field. The energy dispersion of collective excitations, the spectrum of sound velocity, and the effective magnetic mass of magnetoexcitons are obtained in the integer quantum Hall regime for high magnetic fields. The superfluid density and the temperature of the Kosterlitz-Thouless phase transition are probed as functions of the excitonic density, the magnetic field, and the interlayer separation.