Rotons in a hybrid bose-fermi system

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

doi:10.1103/PhysRevLett.105.140402

Rotons in a hybrid bose-fermi system

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

Faculty of Physical Sciences

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

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 language	English
Article number	140402
Journal	Physical Review Letters
Volume	105
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.105.140402
Publication status	Published - 28 Sept 2010

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Rotons in a hybrid bose-fermi system

Abstract

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