Rotons in a hybrid Bose-Fermi system

Abstract

We calculate the spectrum of elementary excitations in a two-dimensional exciton superfluid in the vicinity of a two-dimensional electron gas. We show that attraction of excitons due to their scattering with free electrons may lead to formation of a roton minimum. The energy of this minimum may go below the ground state energy which manifests breaking of the superfluidity. The Berezinsky-Kosterlitz-Thouless phase transition temperature decreases due to the exciton-exciton attraction mediated by electrons.

Revised version with parameters of realistic GaAs double quantum well, accepted for publication in Phys. Rev. Lett

References in corpus (1)

• Bose glass and superfuid phases of cavity polaritons

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