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Propagation dynamic...
Propagation dynamics of exciton spins in a high-density semiconductor quantum dot system
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- Murayama, A. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Furuta, T. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Oshino, S. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Hyomi, K. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Sakuma, M. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Souma, I. (författare)
- Institute of Multidisciplinar Research for Advanced Materials
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- Dagnelund, Daniel (författare)
- Linköpings universitet,Funktionella elektroniska material,Tekniska högskolan
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- Buyanova, Irina A. (författare)
- Linköpings universitet,Tekniska högskolan,Funktionella elektroniska material
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- Chen, Weimin (författare)
- Linköpings universitet,Funktionella elektroniska material,Tekniska högskolan
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(creator_code:org_t)
- 2008-12-11
- 2009
- Engelska.
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Ingår i: physica status solidi c. - : phys. stat. sol. c. - 1862-6351 .- 1610-1642.
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We study propagation dynamics of exciton spins in a system composed of high-density self-assembled quantum dots (QDs) of CdSe and a diluted magnetic semiconductor (DMS) layer of ZnMnSe, where spin-polarized excitons are generated in the DMS layer and are subsequently injected into the QDs. The degree of circular polarization, P, of excitonic photoluminescence at 5 T in the coupled QDs shows a rapid increase with increasing delay time after a linearly polarized pulsed excitation, indicating the exciton-spin injection from the ZnMnSe to CdSe-QDs. The P value tends to decay gradually because of the exciton-spin relaxation in the QDs after the injection. The spin-polarized excitons in the QD ensemble migrate simultaneously from the QDs with higher exciton energies to those with lower exciton energies, where the exciton-spins relax inside each dot during the migration. Therefore, the observed P values in the QD emission band are affected by this feeding of the relaxed spins.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- NATURAL SCIENCES
- NATURVETENSKAP
- Semiconductor physics
- Halvledarfysik
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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