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Title: Negatively charged excitons in semimagnetic CdSe/ZnSe/ZnMnSe quantum dots

Abstract

Low-temperature (T = 1.6 K) photoluminescence (PL) of individual CdSe/ZnSe/ZnMnSe quantum dots (QDs) with different magnitudes of the sp-d exchange interaction between the magnetic impurity ions and charge carriers has been studied in a magnetic field up to 12 T applied in the Faraday and Voigt geometry. The magnitude of the interaction was controlled by changing the fraction ({eta}{sub e,h}) of the squared wave function of charge carriers in the semimagnetic barrier by means of variation of the nonmagnetic (ZnSe) layer thickness. It is established that the sp-d exchange interaction leads to a change in the sign of the effective hole g factor even for {eta}{sub e,h} {approx} 5%, while further increase in the interaction magnitude is accompanied by a rapid growth in the magnitude of spin splitting for both electrons and holes. The quantum yield of PL exhibits a significant decrease due to nonradiative Auger recombination with the excitation of Mn ions only for {eta}{sub e,h} {approx} 12%, while the rate of the holes spin relaxation starts growing only for still higher {eta}{sub e,h} values. In a strong magnetic field perpendicular to the sample plane, the alignment of Mn spins leads to suppression of the Auger recombination only inmore » the excited spin state. For a small rate of the hole spin relaxation, this leads to a rather unusual result: the emission from an excited trion state predominates in strong magnetic fields.« less

Authors:
; ; ;  [1]; ;  [2]
  1. Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
  2. Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
21075727
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 105; Journal Issue: 2; Other Information: DOI: 10.1134/S1063776107080109; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SELENIDES; CHARGE CARRIERS; ELECTRONS; EXCHANGE INTERACTIONS; EXCITATION; EXCITONS; HOLES; LANDE FACTOR; MAGNETIC FIELDS; MANGANESE IONS; MANGANESE SELENIDES; PHOTOLUMINESCENCE; QUANTUM DOTS; RECOMBINATION; SPIN; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; WAVE FUNCTIONS; ZINC SELENIDES

Citation Formats

Brichkin, A. S., E-mail: brich@issp.ac.ru, Chernenko, A V, Chekhovich, E A, Dorozhkin, P S, Kulakovskii, V D, Ivanov, S V, and Toropov, A A. Negatively charged excitons in semimagnetic CdSe/ZnSe/ZnMnSe quantum dots. United States: N. p., 2007. Web. doi:10.1134/S1063776107080109.
Brichkin, A. S., E-mail: brich@issp.ac.ru, Chernenko, A V, Chekhovich, E A, Dorozhkin, P S, Kulakovskii, V D, Ivanov, S V, & Toropov, A A. Negatively charged excitons in semimagnetic CdSe/ZnSe/ZnMnSe quantum dots. United States. https://doi.org/10.1134/S1063776107080109
Brichkin, A. S., E-mail: brich@issp.ac.ru, Chernenko, A V, Chekhovich, E A, Dorozhkin, P S, Kulakovskii, V D, Ivanov, S V, and Toropov, A A. Wed . "Negatively charged excitons in semimagnetic CdSe/ZnSe/ZnMnSe quantum dots". United States. https://doi.org/10.1134/S1063776107080109.
@article{osti_21075727,
title = {Negatively charged excitons in semimagnetic CdSe/ZnSe/ZnMnSe quantum dots},
author = {Brichkin, A. S., E-mail: brich@issp.ac.ru and Chernenko, A V and Chekhovich, E A and Dorozhkin, P S and Kulakovskii, V D and Ivanov, S V and Toropov, A A},
abstractNote = {Low-temperature (T = 1.6 K) photoluminescence (PL) of individual CdSe/ZnSe/ZnMnSe quantum dots (QDs) with different magnitudes of the sp-d exchange interaction between the magnetic impurity ions and charge carriers has been studied in a magnetic field up to 12 T applied in the Faraday and Voigt geometry. The magnitude of the interaction was controlled by changing the fraction ({eta}{sub e,h}) of the squared wave function of charge carriers in the semimagnetic barrier by means of variation of the nonmagnetic (ZnSe) layer thickness. It is established that the sp-d exchange interaction leads to a change in the sign of the effective hole g factor even for {eta}{sub e,h} {approx} 5%, while further increase in the interaction magnitude is accompanied by a rapid growth in the magnitude of spin splitting for both electrons and holes. The quantum yield of PL exhibits a significant decrease due to nonradiative Auger recombination with the excitation of Mn ions only for {eta}{sub e,h} {approx} 12%, while the rate of the holes spin relaxation starts growing only for still higher {eta}{sub e,h} values. In a strong magnetic field perpendicular to the sample plane, the alignment of Mn spins leads to suppression of the Auger recombination only in the excited spin state. For a small rate of the hole spin relaxation, this leads to a rather unusual result: the emission from an excited trion state predominates in strong magnetic fields.},
doi = {10.1134/S1063776107080109},
url = {https://www.osti.gov/biblio/21075727}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 2,
volume = 105,
place = {United States},
year = {2007},
month = {8}
}