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Optical and theoretical investigations of small InP quantum dots in GaxIn1-xP

Persson, Jonas LU ; Holm, Magnus LU ; Pryor, C; Hessman, Dan LU ; Seifert, Werner LU ; Samuelson, Lars LU and Pistol, Mats-Erik LU (2003) In Physical Review B (Condensed Matter and Materials Physics) 67(3).
Abstract
We have studied small InP quantum dots in a GaInP matrix theoretically and experimentally. Using low-temperature photoluminescence spectroscopy in conjunction with six band k.p calculations, including direct and exchange interactions, we show that the dot size is a crucial parameter that determines whether the dot is neutral or charged with electrons in the nominally undoped n-type host material. For a small enough quantum dot, the conduction-band ground state is positioned above the Fermi level and the dot remains neutral. However, as soon as the dot is large enough for the conduction-band ground state to be located below the Fermi level the dot is charged. Furthermore, we show that, for neutral quantum dots, the position of the... (More)
We have studied small InP quantum dots in a GaInP matrix theoretically and experimentally. Using low-temperature photoluminescence spectroscopy in conjunction with six band k.p calculations, including direct and exchange interactions, we show that the dot size is a crucial parameter that determines whether the dot is neutral or charged with electrons in the nominally undoped n-type host material. For a small enough quantum dot, the conduction-band ground state is positioned above the Fermi level and the dot remains neutral. However, as soon as the dot is large enough for the conduction-band ground state to be located below the Fermi level the dot is charged. Furthermore, we show that, for neutral quantum dots, the position of the bi-exciton emission line with respect to the exciton emission line depends on the size of the quantum dot and that the bi-exciton emission can be on either side of the exciton emission: for the smallest dots the bi-exciton emission is always at higher energy than the exciton emission but for larger dots the ordering is the opposite with the exciton emission line on the high-energy side. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
67
issue
3
publisher
American Physical Society
external identifiers
  • wos:000180943800082
  • scopus:0037437921
ISSN
1098-0121
DOI
10.1103/PhysRevB.67.035320
language
English
LU publication?
yes
id
a2922835-bab5-44de-8f81-3b8d17276fca (old id 318149)
date added to LUP
2007-09-20 09:21:09
date last changed
2017-04-23 04:30:55
@article{a2922835-bab5-44de-8f81-3b8d17276fca,
  abstract     = {We have studied small InP quantum dots in a GaInP matrix theoretically and experimentally. Using low-temperature photoluminescence spectroscopy in conjunction with six band k.p calculations, including direct and exchange interactions, we show that the dot size is a crucial parameter that determines whether the dot is neutral or charged with electrons in the nominally undoped n-type host material. For a small enough quantum dot, the conduction-band ground state is positioned above the Fermi level and the dot remains neutral. However, as soon as the dot is large enough for the conduction-band ground state to be located below the Fermi level the dot is charged. Furthermore, we show that, for neutral quantum dots, the position of the bi-exciton emission line with respect to the exciton emission line depends on the size of the quantum dot and that the bi-exciton emission can be on either side of the exciton emission: for the smallest dots the bi-exciton emission is always at higher energy than the exciton emission but for larger dots the ordering is the opposite with the exciton emission line on the high-energy side.},
  articleno    = {035320},
  author       = {Persson, Jonas and Holm, Magnus and Pryor, C and Hessman, Dan and Seifert, Werner and Samuelson, Lars and Pistol, Mats-Erik},
  issn         = {1098-0121},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Optical and theoretical investigations of small InP quantum dots in GaxIn1-xP},
  url          = {http://dx.doi.org/10.1103/PhysRevB.67.035320},
  volume       = {67},
  year         = {2003},
}