Rotons in a Hybrid Bose-Fermi System

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

Phys. Rev. Lett. 105, 140402 – Published 28 September 2010; Erratum Phys. Rev. Lett. 105, 199902 (2010)

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.

Received 17 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.140402

Erratum

Erratum: Rotons in a Hybrid Bose-Fermi System [Phys. Rev. Lett.PRLTAO0031-9007 105, 140402 (2010)10.1103/PhysRevLett.105.140402]

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

Phys. Rev. Lett. 105, 199902 (2010)

Authors & Affiliations

Ivan A. Shelykh

Science Institute, University of Iceland, Dunhagi-3, IS-107, Reykjavik, Iceland and International Institute for Physics, UFRN—Universidade Federal do Rio Grande do Norte, Campus Universitario Lagoa Nova, CEP: 59078-970, Natal- RN, Brazil

Thomas Taylor and Alexey V. Kavokin

School of Physics and Astronomy, University of Southampton, Highfield Southampton, SO171BJ, United Kingtom

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Issue

Vol. 105, Iss. 14 — 1 October 2010

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