Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots

Sang Hoon Lee, M. Dobrowolska, J. K. Furdyna

Research output: Contribution to journalArticle

Abstract

The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.

Original languageEnglish
Pages (from-to)851-854
Number of pages4
JournalJournal of Crystal Growth
Volume311
Issue number3
DOIs
Publication statusPublished - 2009 Jan 15

Fingerprint

Semiconductor quantum dots
Circular polarization
Photoluminescence
circular polarization
quantum dots
Polarization
photoluminescence
polarization
excitation
Magnetic fields
Spin polarization
magnetic fields
energy
profiles
Experiments

Keywords

  • A. Magnetic semiconductor
  • A. Quantum dot
  • E. Polarization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Inorganic Chemistry

Cite this

Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots. / Lee, Sang Hoon; Dobrowolska, M.; Furdyna, J. K.

In: Journal of Crystal Growth, Vol. 311, No. 3, 15.01.2009, p. 851-854.

Research output: Contribution to journalArticle

@article{09a830f5e79146239e85e1d7c1787578,
title = "Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots",
abstract = "The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.",
keywords = "A. Magnetic semiconductor, A. Quantum dot, E. Polarization",
author = "Lee, {Sang Hoon} and M. Dobrowolska and Furdyna, {J. K.}",
year = "2009",
month = "1",
day = "15",
doi = "10.1016/j.jcrysgro.2008.09.101",
language = "English",
volume = "311",
pages = "851--854",
journal = "Journal of Crystal Growth",
issn = "0022-0248",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots

AU - Lee, Sang Hoon

AU - Dobrowolska, M.

AU - Furdyna, J. K.

PY - 2009/1/15

Y1 - 2009/1/15

N2 - The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.

AB - The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ- and σ+ circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+ circular polarization, the higher energy side of the band was dominated by the σ- circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+ circular polarization, while it showed no significant change for σ- circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems.

KW - A. Magnetic semiconductor

KW - A. Quantum dot

KW - E. Polarization

UR - http://www.scopus.com/inward/record.url?scp=59749085646&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=59749085646&partnerID=8YFLogxK

U2 - 10.1016/j.jcrysgro.2008.09.101

DO - 10.1016/j.jcrysgro.2008.09.101

M3 - Article

AN - SCOPUS:59749085646

VL - 311

SP - 851

EP - 854

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

SN - 0022-0248

IS - 3

ER -