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Rotons in a hybrid Bose-Fermi system

Rotons in a hybrid Bose-Fermi system
Rotons in a hybrid Bose-Fermi system
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
140402-[4pp]
Shelykh, Ivan A.
15cf9517-d657-414d-9b2a-191a73faf599
Taylor, Thomas
1a05c484-c420-4c90-b822-0dc0aa51f8e0
Kavokin, Alexey V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Shelykh, Ivan A.
15cf9517-d657-414d-9b2a-191a73faf599
Taylor, Thomas
1a05c484-c420-4c90-b822-0dc0aa51f8e0
Kavokin, Alexey V.
70ffda66-cfab-4365-b2db-c15e4fa1116b

Shelykh, Ivan A., Taylor, Thomas and Kavokin, Alexey V. (2010) Rotons in a hybrid Bose-Fermi system. Physical Review Letters, 105 (14), 140402-[4pp]. (doi:10.1103/PhysRevLett.105.140402).

Record type: Article

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

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Published date: 1 October 2010

Identifiers

Local EPrints ID: 180557
URI: http://eprints.soton.ac.uk/id/eprint/180557
DOI: doi:10.1103/PhysRevLett.105.140402
PURE UUID: 7352c65d-92a2-4a70-97c1-ce9b0d169f3a

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Date deposited: 11 Apr 2011 07:58
Last modified: 14 Mar 2024 02:52

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Author: Ivan A. Shelykh
Author: Thomas Taylor
Author: Alexey V. Kavokin

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