physica status solidi (a) · 2006 · 10 citations · 9 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsQuantum MechanicsSemiconductor MaterialsNanoelectronicsOptical Properties Of SemiconductorsQuantum DotsSemiconductor NanomaterialsSemiconductor PhysicsStrongly Correlated Electron SystemsElectron Spin RelaxationHyperfine SpectroscopyPolarizationPolarization Effects In ExcitationSelf-assembled Quantum DotsSemiconductor Quantum DotsSpin Dynamics In SemiconductorsSpin Physics
Abstract We report on electron spin physics in a single charge‐tunable self‐assembled InAs/GaAs quantum dot. The hyperfine interaction between the optically oriented electron and nuclear spins leads to the polarization of the quantum dot nuclei. The sign of the resulting Overhauser‐shift depends on the trion state X + or X – , and remarkably its strength does not vanish in zero magnetic field. This explains the quenching of X + spin relaxation under steady‐state excitation polarization. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Optically programmable electron spin memory using semiconductor quantum dots
M. Kroutvar, Y. Ducommun, D. Heiss et al. · Nature · 2004 · 959 citations