Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots

Eunsoon Oh; D. G. Choi; Shin Kim; S. Lee; J. K. Furdyna; D. G. Oh

doi:10.1016/j.ssc.2005.05.053

Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots

Eunsoon Oh, D. G. Choi, Shin Kim, S. Lee, J. K. Furdyna, D. G. Oh

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs.

Original language	English
Pages (from-to)	471-474
Number of pages	4
Journal	Solid State Communications
Volume	135
Issue number	8
DOIs	https://doi.org/10.1016/j.ssc.2005.05.053
Publication status	Published - 2005 Aug

Bibliographical note

Funding Information:
This work was supported by Basic Research Program of the Korea Science and Engineering Foundation (Grant No. R04-2003-000-10020-0) and KOSEF (Grant No. R01-2005-000-10616-0).

Keywords

A. Magnetic semiconductor
A. Quantum dot
D. Magneto-optics

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2005.05.053

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title = "Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots",

abstract = "We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs.",

keywords = "A. Magnetic semiconductor, A. Quantum dot, D. Magneto-optics",

author = "Eunsoon Oh and Choi, {D. G.} and Shin Kim and S. Lee and Furdyna, {J. K.} and Oh, {D. G.}",

note = "Funding Information: This work was supported by Basic Research Program of the Korea Science and Engineering Foundation (Grant No. R04-2003-000-10020-0) and KOSEF (Grant No. R01-2005-000-10616-0).",

year = "2005",

month = aug,

doi = "10.1016/j.ssc.2005.05.053",

language = "English",

volume = "135",

pages = "471--474",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

number = "8",

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TY - JOUR

T1 - Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots

AU - Oh, Eunsoon

AU - Choi, D. G.

AU - Kim, Shin

AU - Lee, S.

AU - Furdyna, J. K.

AU - Oh, D. G.

N1 - Funding Information: This work was supported by Basic Research Program of the Korea Science and Engineering Foundation (Grant No. R04-2003-000-10020-0) and KOSEF (Grant No. R01-2005-000-10616-0).

PY - 2005/8

Y1 - 2005/8

N2 - We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs.

AB - We studied spin states of CdSe quantum dots (QDs) coupled with CdMnSe QDs by probing circular polarization of photoluminescence spectrum under external magnetic fields. The bandgap energies of CdSe and CdMnSe QDs are close to each other and photoluminescence mainly originates from CdSe QDs due to relatively low radiation efficiency of CdMnSe QDs. The photoluminescence lifetime as well as its intensity was decreased with increasing magnetic field, which was ascribed to the increase in the ground state wavefunctions in CdMnSe QDs. The decrease was more pronounced for spin down electrons, which was explained by the difference in spin up and down wave functions under magnetic fields. Our results show that the spin state of CdSe QDs can be manipulated by coupling with CdMnSe QDs.

KW - A. Magnetic semiconductor

KW - A. Quantum dot

KW - D. Magneto-optics

UR - http://www.scopus.com/inward/record.url?scp=22644437888&partnerID=8YFLogxK

U2 - 10.1016/j.ssc.2005.05.053

DO - 10.1016/j.ssc.2005.05.053

M3 - Article

AN - SCOPUS:22644437888

SN - 0038-1098

VL - 135

SP - 471

EP - 474

JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

Control of spin state in CdSe quantum dots by coupling with magnetic semiconductor quantum dots

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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