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Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot | | C. Fasth
; A. Fuhrer
; L. Samuelson
; Vitaly N. Golovach
; Daniel Loss
; | | Date: |
9 Jan 2007 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated
Electrons | | 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 simple method to directly determine the magnitude of the spin-orbit interaction in a two-electron artificial atom with strong spin-orbit coupling. Due to a large effective g-factor g* =8+/-1 the transition from singlet S to triplet T+ groundstate 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}approx$127 nm in such systems using a simple model. | | Source: | arXiv, cond-mat/0701161 | | Other source: | [GID 684627] pmid17678116 | | Services: | Forum | Review | PDF | Favorites | |
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