Exciton spin dynamics in CdTe/ZnTe quantum structures

We have investigated the exciton spin dynamics in an ultrathin CdTe/ZnTe single quantum well (QW) and self‐assembled quantum dots (QDs) by observing time‐resolved Kerr rotation (TRKR). At temperatures low enough to suppress the thermal escape of holes from the quantum‐confinement structures, exciton...

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Published inPhysica Status Solidi (b) Vol. 248; no. 2; pp. 389 - 392
Main Authors Tomimoto, Shinichi, Nozawa, Shinsuke, Terai, Yoshikazu, Kuroda, Shinji, Takita, Kôki, Masumoto, Yasuaki
Format Journal Article
LanguageEnglish
Published Berlin WILEY-VCH Verlag 01.02.2011
WILEY‐VCH Verlag
Subjects
Cadmium tellurides
Escape structures
Excitation
excitons
excitons, Kerr rotation
Kerr rotation
Magnetic fields
Quantum dots
Quantum wells
Spin dynamics
Zinc tellurides
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Summary:We have investigated the exciton spin dynamics in an ultrathin CdTe/ZnTe single quantum well (QW) and self‐assembled quantum dots (QDs) by observing time‐resolved Kerr rotation (TRKR). At temperatures low enough to suppress the thermal escape of holes from the quantum‐confinement structures, excitons dominate the TRKR signal. It shows characteristic dependence on the magnetic field, which is distinctly different from that of isolated electrons. From the data, we have estimated the electron–hole exchange energy to be 137 µeV in the QW, and larger than 190 µeV in the QDs.
Bibliography:ark:/67375/WNG-GFV2F5NV-7
ArticleID:PSSB201000805
istex:683F8EA011A5AC450B820763CFF3C920C5D6F994
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0370-1972
1521-3951
1521-3951
DOI:10.1002/pssb.201000805