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Exciton fine structure splitting in InP quantum dots in GaInP

Ellström, Carl LU ; Seifert, Werner LU ; Pryor, C.; Samuelson, Lars LU and Pistol, Mats-Erik LU (2007) In Journal of Physics: Condensed Matter 19(29).
Abstract
We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground ( vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines ( the fine structure splitting) is 150(+/- 30) mu eV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of... (More)
We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground ( vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines ( the fine structure splitting) is 150(+/- 30) mu eV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of elongation of the dots and is close to zero for dots of cylindrical symmetry, despite the influence of the piezoelectric polarization, which is included in the calculation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter
volume
19
issue
29
publisher
IOP Publishing
external identifiers
  • wos:000247929700013
  • scopus:34547346633
ISSN
1361-648X
DOI
10.1088/0953-8984/19/29/295211
language
English
LU publication?
yes
id
4ae1568e-8819-4af9-94e1-09cd14742c9d (old id 645592)
date added to LUP
2007-12-10 16:01:55
date last changed
2017-01-01 07:09:03
@article{4ae1568e-8819-4af9-94e1-09cd14742c9d,
  abstract     = {We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground ( vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines ( the fine structure splitting) is 150(+/- 30) mu eV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of elongation of the dots and is close to zero for dots of cylindrical symmetry, despite the influence of the piezoelectric polarization, which is included in the calculation.},
  articleno    = {295211},
  author       = {Ellström, Carl and Seifert, Werner and Pryor, C. and Samuelson, Lars and Pistol, Mats-Erik},
  issn         = {1361-648X},
  language     = {eng},
  number       = {29},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter},
  title        = {Exciton fine structure splitting in InP quantum dots in GaInP},
  url          = {http://dx.doi.org/10.1088/0953-8984/19/29/295211},
  volume       = {19},
  year         = {2007},
}