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Excitonic condensation in spatially separated one-dimensional systems
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). KTH Royal Institute of Technology, Sweden.ORCID-id: 0000-0002-6166-181x
Rekke forfattare: 12015 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 106, nr 21, artikkel-id 213103Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We show theoretically that excitons can form from spatially separated one-dimensional ground state populations of electrons and holes, and that the resulting excitons can form a quasicondensate. We describe a mean-field Bardeen-Cooper-Schrieffer theory in the low carrier density regime and then focus on the core-shell nanowire giving estimates of the size of the excitonic gap for InAs/GaSb wires and as a function of all the experimentally relevant parameters. We find that optimal conditions for pairing include small overlap of the electron and hole bands, large effective mass of the carriers, and low dielectric constant of the surrounding media. Therefore, one-dimensional systems provide an attractive platform for the experimental detection of excitonic quasicondensation in zero magnetic field.

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2015. Vol. 106, nr 21, artikkel-id 213103
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URN: urn:nbn:se:su:diva-119067DOI: 10.1063/1.4921792ISI: 000355631400037OAI: oai:DiVA.org:su-119067DiVA, id: diva2:846062
Tilgjengelig fra: 2015-08-14 Laget: 2015-07-27 Sist oppdatert: 2022-02-24bibliografisk kontrollert

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