Rotons in a hybrid Bose-Fermi system

Details Rotons in a hybrid Bose-Fermi system Rotons in a hybrid Bose-Fermi system

2010-07-17

arxiv.org/abs/1007.2891v2

Phys. Rev. Lett. 105, 140402 (2010)

Physics

Condensed Matter

Quantum Gases

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

Scientific paper

10.1103/PhysRevLett.105.140402

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.

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