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RESEARCH PRODUCT
Interaction-induced spin polarization in quantum dots.
M.c. RoggeEsa RäsänenRolf J. Haugsubject
Fock-Darwin spectrumSpin polarizationSpin-density-functional theoryQuantum DotGeneral Physics and AstronomyFOS: Physical sciencesElectronSpin dynamicsShubnikov–de Haas effectMesoscale and Nanoscale Physics (cond-mat.mes-hall)Electronic statesSemiconductor quantum dotsddc:530Landau levelsSpin-½PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsSpin polarizationCoulomb blockadeHigh magnetic fieldsLandau quantizationCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMagnetic fieldQuantum dotMagnetic fieldsDensity functional theoryDewey Decimal Classification::500 | Naturwissenschaften::530 | PhysikInteraction effectdescription
The electronic states of lateral many electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb blockade peaks are measured. A zig-zag pattern is found as it is known from the Fock-Darwin spectrum. However, only data from Landau level 0 show the typical spin-induced bimodality, whereas features from Landau level 1 cannot be explained with the Fock-Darwin picture. Instead, by including the interaction effects within spin-density-functional theory a good agreement between experiment and theory is obtained. The absence of bimodality on Landau level 1 is found to be due to strong spin polarization.
year | journal | country | edition | language |
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2010-01-29 | Physical review letters |