Time Reversal Symmetric Topological Exciton Condensate in Bilayer HgTe Quantum Wells
Time Reversal Symmetric Topological Exciton Condensate in Bilayer HgTe Quantum Wells
We investigate a bilayer system of critical HgTe quantum wells, each featuring a spin-degenerate pair of massless Dirac fermions. In the presence of an electrostatic interlayer Coulomb coupling, we determine the exciton condensate order parameter of the system self-consistently. Calculating the bulk topological Z2 invariant of the resulting mean-field Hamiltonian, …