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Excitonic condensation in spatially separated one-dimensional systems
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.ORCID iD: 0000-0002-6166-181X
2015 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 106, no 21, 213103Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2015. Vol. 106, no 21, 213103
Keyword [en]
Excitons, Ground state, Nanowires, Bardeen-Cooper-Schrieffer theory, Core-shell nanowires, Electrons and holes, Low carrier density, Low dielectric constants, One-dimensional systems, Optimal conditions, Zero magnetic fields
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-169967DOI: 10.1063/1.4921792ISI: 000355631400037ScopusID: 2-s2.0-84930662025OAI: diva2:826491
EU, European Research Council, DM-321031

QC 20150625

Available from: 2015-06-25 Created: 2015-06-25 Last updated: 2015-06-25Bibliographically approved

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Abergel, David
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