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Direct measurement of the spin-orbit interaction in a two-electron InAs nanowire quantum dot

Fasth, C. and Fuhrer, A. and Samuelson, L. and Golovach, Vitaly N. and Loss, Daniel. (2007) Direct measurement of the spin-orbit interaction in a two-electron InAs nanowire quantum dot. Physical review letters, Vol. 98, H. 26 , 266801, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5254623

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Abstract

We demonstrate control of the electron number down to the last electron in tunable few-electron quantum dots defined in catalytically grown InAs nanowires. Using low temperature transport spectroscopy in the Coulomb blockade regime, we propose a method to directly determine the magnitude of the spin-orbit interaction in a two-electron artificial atom with strong spin-orbit coupling. Because of a large effective g factor vertical bar g(*)vertical bar=8 +/- 1, the transition from a singlet S to a triplet T+ ground state with increasing magnetic field is dominated by the Zeeman energy rather than by orbital effects. We find that the spin-orbit coupling mixes the T+ and S states and thus induces an avoided crossing with magnitude Delta(SO)=0.25 +/- 0.05 meV. This allows us to calculate the spin-orbit length lambda(SO)approximate to 127 nm in such systems using a simple model.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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