Rotons in a hybrid bose-fermi system

Ivan A. Shelykh, Thomas Taylor, Alexey V. Kavokin

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We calculate the spectrum of elementary excitations in a two-dimensional exciton condensate 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.

Original languageEnglish
Article number140402
JournalPhysical Review Letters
Issue number14
Publication statusPublished - 28 Sept 2010


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