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Density of States Measured by Scanning-Tunneling Spectroscopy Sheds New Light on the Optical Transitions in PbSe Nanocrystals

descriptionPublicationkeyboard_double_arrow_right Article 17 Aug 2005 France, Netherlands English Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 95 (issn: 0031-9007, eissn: 1079-7114,

Authors: Liljeroth, Peter; Zeijlmans van Emmichoven, P.A.; Hickey, Stephen G.; Weller, Horst; Grandidier, B.; Allan, Guy; Vanmaekelbergh, Daniel;

doi: 10.1103/physrevlett.95.086801

pmid: 16196889

Density of States Measured by Scanning-Tunneling Spectroscopy Sheds New Light on the Optical Transitions in PbSe Nanocrystals

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Abstract

The density-of-states function of individual colloidal PbSe nanocrystals varying in diameter between 3 and 7 nm is measured by resonant tunneling spectroscopy. It is in semiquantitative agreement with tight-binding calculations, but the energy separation between electron (hole) levels of S and P symmetry is systematically smaller than predicted by the theory. These results provide an explanation for the second and third excitonic optical transitions, which have been debated for a long time.

Countries

France, Netherlands

Related Organizations

Utrecht University
Netherlands
French National Centre for Scientific Research
France
Universität Hamburg
Germany
University Museum Utrecht
Netherlands
Centre national de la recherche scientifique
France

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Keywords

[SPI] Engineering Sciences [physics], International

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