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Magnetic field effects on optical and transport properties in InAs/GaAs quantum dots

Larsson, M. ; Moskalenko, E. S. ; Larsson, L. A. ; Holtz, P. O. ; Verdozzi, Claudio LU ; Almbladh, Carl-Olof LU ; Schoenfeld, W. V. and Petroff, P. M. (2006) In Physical Review B (Condensed Matter and Materials Physics) 74(24).
Abstract
A photoluminescence study of self-assembled InAs/GaAs quantum dots under the influence of magnetic fields perpendicular and parallel to the dot layer is presented. At low temperatures, the magnetic field perpendicular to the dot layer alters the in-plane transport properties due to localization of carriers in wetting layer (WL) potential fluctuations. Decreased transport in the WL results in a reduced capture into the quantum dots and consequently a weakened dot-related emission. The effect of the magnetic field exhibits a considerable dot density dependence, which confirms the correlation to the in-plane transport properties. An interesting effect is observed at temperatures above approximately 100 K, for which magnetic fields, both... (More)
A photoluminescence study of self-assembled InAs/GaAs quantum dots under the influence of magnetic fields perpendicular and parallel to the dot layer is presented. At low temperatures, the magnetic field perpendicular to the dot layer alters the in-plane transport properties due to localization of carriers in wetting layer (WL) potential fluctuations. Decreased transport in the WL results in a reduced capture into the quantum dots and consequently a weakened dot-related emission. The effect of the magnetic field exhibits a considerable dot density dependence, which confirms the correlation to the in-plane transport properties. An interesting effect is observed at temperatures above approximately 100 K, for which magnetic fields, both perpendicular and parallel to the dot layer, induced an increment of the quantum dot photoluminescence. This effect is ascribed to the magnetic confinement of the exciton wave function, which increases the probability for carrier capture and localization in the dot, but affects also the radiative recombination with a reduced radiative lifetime in the dots under magnetic compression. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
74
issue
24
publisher
American Physical Society
external identifiers
  • wos:000243195800074
  • scopus:33845458117
ISSN
1098-0121
DOI
10.1103/PhysRevB.74.245312
language
English
LU publication?
yes
id
b9f5a0f1-788e-4e10-9c29-31aeac81bfdc (old id 679889)
date added to LUP
2016-04-01 15:55:38
date last changed
2020-11-29 04:22:30
@article{b9f5a0f1-788e-4e10-9c29-31aeac81bfdc,
  abstract     = {A photoluminescence study of self-assembled InAs/GaAs quantum dots under the influence of magnetic fields perpendicular and parallel to the dot layer is presented. At low temperatures, the magnetic field perpendicular to the dot layer alters the in-plane transport properties due to localization of carriers in wetting layer (WL) potential fluctuations. Decreased transport in the WL results in a reduced capture into the quantum dots and consequently a weakened dot-related emission. The effect of the magnetic field exhibits a considerable dot density dependence, which confirms the correlation to the in-plane transport properties. An interesting effect is observed at temperatures above approximately 100 K, for which magnetic fields, both perpendicular and parallel to the dot layer, induced an increment of the quantum dot photoluminescence. This effect is ascribed to the magnetic confinement of the exciton wave function, which increases the probability for carrier capture and localization in the dot, but affects also the radiative recombination with a reduced radiative lifetime in the dots under magnetic compression.},
  author       = {Larsson, M. and Moskalenko, E. S. and Larsson, L. A. and Holtz, P. O. and Verdozzi, Claudio and Almbladh, Carl-Olof and Schoenfeld, W. V. and Petroff, P. M.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {24},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Magnetic field effects on optical and transport properties in InAs/GaAs quantum dots},
  url          = {http://dx.doi.org/10.1103/PhysRevB.74.245312},
  doi          = {10.1103/PhysRevB.74.245312},
  volume       = {74},
  year         = {2006},
}