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Get Free AccessPolarization-resolved magnetophotoluminescence spectroscopy is used to study exciton spin states in 40--80 \AA{} diameter chemically synthesized CdSe quantum dots (QDs) at temperatures $T=1.2--50\mathrm{K}.$ The spin polarization is found not to saturate in magnetic fields to 60 T and time-resolved studies indicate a thermal population of exciton states. A simple model incorporating the angle-dependent Zeeman splitting and bright-dark level mixing in these randomly oriented quantum dots is constructed in quantitative agreement with the data. Fits using this model yield a dark exciton g factor of \ensuremath{\sim}0.9 at $T=1.45\mathrm{K},$ which is independent of QD diameter and exhibits a surprising increase with increasing temperature.
Ezekiel Johnston‐Halperin, D. D. Awschalom, S. A. Crooker, Al. L. Éfros, M. Rosen, Xiaogang Peng, Paul Alivisatos (2001). Spin spectroscopy of dark excitons in CdSe quantum dots to 60 T. , 63(20), DOI: https://doi.org/10.1103/physrevb.63.205309.
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Type
Article
Year
2001
Authors
7
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1103/physrevb.63.205309
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