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Spin polarization of the neutral exciton in a single quantum dot
Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska högskolan.
2011 (engelsk)Inngår i: SUPERLATTICES AND MICROSTRUCTURES, ISSN 0749-6036, Vol. 49, nr 3, s. 294-299Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

While efficient nuclear polarization has earlier been reported for the charged exciton in InAs/GaAs quantum dots at zero external magnetic field, we report here on a surprisingly high degree of circular polarization, up to approximate to 60%, for the neutral exciton emission in individual InAs/GaAs dots. This high degree of polarization is explained in terms of the appearance of an effective nuclear magnetic field which stabilizes the electron spin. The nuclear polarization is manifested in experiments as a detectable Overhauser shift. In turn, the nuclei located inside the dot are exposed to an effective electron magnetic field, the Knight field. This nuclear polarization is understood as being due to the dynamical nuclear polarization by an electron localized in the QD. The high degree of polarization for the neutral exciton is also suggested to be due to separate in-time capture of electrons and holes into the QD.

sted, utgiver, år, opplag, sider
Elsevier Science B.V., Amsterdam , 2011. Vol. 49, nr 3, s. 294-299
Emneord [en]
Quantum dot, Exciton, Polarization, Photoluminescence, Spin
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-67540DOI: 10.1016/j.spmi.2010.06.012ISI: 000288929500020OAI: oai:DiVA.org:liu-67540DiVA, id: diva2:411269
Tilgjengelig fra: 2011-04-18 Laget: 2011-04-18 Sist oppdatert: 2013-05-07

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