Dynamical magnetic and nuclear polarization in complex spin systems: Semi-magnetic II-VI quantum dots

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DOIResolve DOI: http://doi.org/10.1088/1367-2630/15/6/063039
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TypeArticle
Journal titleNew Journal of Physics
ISSN1367-2630
Volume15
Article number63039
SubjectDipole interaction; Electron spin transfer; Hyperfine interactions; II-VI quantum dots; Nuclear polarization; Nuclear-spin polarization; Radiative recombination; Spin-polarized excitons; Excitons; Polarization; Semiconductor quantum dots; Spin dynamics; Magnetism
AbstractDynamical magnetic and nuclear polarization in complex spin systems is discussed on the example of transfer of spin from exciton to the central spin of magnetic impurity in a quantum dot in the presence of a finite number of nuclear spins. The exciton is described in terms of electron and heavy-hole spins interacting via exchange interaction with magnetic impurity, via hyperfine interaction with a finite number of nuclear spins and via dipole interaction with photons. The time evolution of the exciton, magnetic impurity and nuclear spins is calculated exactly between quantum jumps corresponding to exciton radiative recombination. The collapse of the wavefunction and the refilling of the quantum dot with a new spin-polarized exciton is shown to lead to the build up of magnetization of the magnetic impurity as well as nuclear spin polarization. The competition between electron spin transfer to magnetic impurity and to nuclear spins simultaneous with the creation of dark excitons is elucidated. The technique presented here opens up the possibility of studying optically induced dynamical magnetic and nuclear polarization in complex spin systems. © 2013 IOP Publishing and Deutsche Physikalische Gesellschaft.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21269977
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Record identifier0d6d92e0-53c8-4a49-88a9-533e51e039f6
Record created2013-12-13
Record modified2016-05-09
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