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Size dependence of electron spin dephasing in InGaAs quantum dots
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-7155-7103
Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan.
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2015 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 106, no 9, 093109- p.Article in journal (Refereed) Published
Abstract [en]

We investigate ensemble electron spin dephasing in self-assembled InGaAs/GaAs quantum dots (QDs) of different lateral sizes by employing optical Hanle measurements. Using low excitation power, we are able to obtain a spin dephasing time T-2* (in the order of ns) of the resident electron after recombination of negative trions in the QDs. We show that T-2* is determined by the hyperfine field arising from the frozen fluctuation of nuclear spins, which scales with the size of QDs following the Merkulov-Efros-Rosen model. This scaling no longer holds in large QDs, most likely due to a breakdown in the lateral electron confinement. (C) 2015 AIP Publishing LLC.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2015. Vol. 106, no 9, 093109- p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-117236DOI: 10.1063/1.4914084ISI: 000351069900054OAI: oai:DiVA.org:liu-117236DiVA: diva2:807096
Note

Funding Agencies|Linkoping University through the Professor Contracts; Swedish Research Council [621-2011-4254, 2008-6582]; Japan Society for Promotion of Science [22221007]

Available from: 2015-04-22 Created: 2015-04-21 Last updated: 2017-12-04

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