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:
http://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
- 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
- 2018-01-07 09:44:28
@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}, }