Optical and theoretical investigations of small InP quantum dots in GaxIn1-xP
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/318149
- author
- Persson, Jonas LU ; Holm, Magnus LU ; Pryor, C ; Hessman, Dan LU ; Seifert, Werner LU ; Samuelson, Lars LU and Pistol, Mats-Erik LU
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 67
- issue
- 3
- article number
- 035320
- 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
- 2016-04-01 17:04:51
- date last changed
- 2025-04-04 14:54:56
@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.}},
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}},
doi = {{10.1103/PhysRevB.67.035320}},
volume = {{67}},
year = {{2003}},
}