Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.140402
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Funding
- RANNIS
- E.U.
- Engineering and Physical Sciences Research Council [EP/F011393/1] Funding Source: researchfish
- EPSRC [EP/F011393/1] Funding Source: UKRI
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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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