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Title: Excitonic condensation in spatially separated one-dimensional systems

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.
Authors:
 [1] ;  [2]
  1. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm (Sweden)
  2. (Sweden)
Publication Date:
OSTI Identifier:
22402500
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BCS THEORY; CARRIER DENSITY; ELECTRONIC STRUCTURE; ELECTRONS; EXCITONS; GALLIUM ANTIMONIDES; GROUND STATES; INDIUM ARSENIDES; MAGNETIC FIELDS; MEAN-FIELD THEORY; NANOSTRUCTURES; PERMITTIVITY