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Intraband relaxation via polaron decay in InAs self-assembled quantum dots

E. A. Zibik, L. R. Wilson, R. P. Green, G. Bastard, R. Ferreira, P. J. Phillips, D. A. Carder, J-P. R. Wells, J. W. Cockburn, M. S. Skolnick, M. J. Steer, and M. Hopkinson
Phys. Rev. B 70, 161305(R) – Published 20 October 2004

Abstract

Three distinct channels for the decay of polarons in InAs quantum dots are identified using energy and temperature-dependent far-infrared pump-probe spectroscopy. For energies up to 53meV a monotonic increase of the polaron relaxation time is observed, the polaron decay being shown to occur into two longitudinal acoustic phonons. Above this energy additional decay channels into two optical phonons are allowed, leading to the observed reduction of the decay time. We also demonstrate interlevel polaron transfer between the closely spaced p-like excited states, with measured transfer times in good agreement with calculations for an acoustic-phonon-mediated process.

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  • Received 6 July 2004

DOI:https://doi.org/10.1103/PhysRevB.70.161305

©2004 American Physical Society

Authors & Affiliations

E. A. Zibik1, L. R. Wilson1,*, R. P. Green1, G. Bastard2, R. Ferreira2, P. J. Phillips3, D. A. Carder3, J-P. R. Wells1, J. W. Cockburn1, M. S. Skolnick1, M. J. Steer4, and M. Hopkinson4

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, United Kingdom
  • 2Laboratoire Pierre Aigrain, 24 rue Lhomond, F75005, Paris, France
  • 3FOM Institute Rijnhuizen, P.O. Box 1207, NL-3430BE Nieuwegein, The Netherlands
  • 4EPSRC National Centre for III-V Technologies, Sheffield, S1 3JD, United Kingdom

  • *Corresponding author: Luke Wilson, Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK. Email address: luke.wilson@sheffield.ac.uk

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Issue

Vol. 70, Iss. 16 — 15 October 2004

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