DOI | Trouver le DOI : https://doi.org/10.1063/1.3633508 |
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Auteur | Rechercher : Ning, J.Q.; Rechercher : Xu, S.J.; Rechercher : Ruan, X.Z.; Rechercher : Ji, Y.; Rechercher : Zheng, H.Z.; Rechercher : Sheng, W.D.; Rechercher : Liu, H.C.1 |
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Affiliation | - Conseil national de recherches du Canada. Institut des sciences des microstructures du CNRC
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Format | Texte, Article |
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Sujet | Electron spins; Electronic band structure; Energy separations; Excitation lasers; Excitation wavelength; InAs/GaAs quantum dots; Kerr rotation; Reflectance spectrum; Resonant excitation; Sign-change; Spin orientations; Spin state; Sub-bands; Time-resolved; Band structure; Laser excitation; Magnetic fields; Rotation; Separation; Spin dynamics; Wetting; Semiconductor quantum dots |
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Résumé | Electronic band structures and spin states of the InAs/GaAs quantum dots (QDs) induced by the wetting-layer fluctuation were investigated by employing the technique of time-resolved Kerr rotation (TRKR) with and without magnetic field. Sign change of the Kerr rotation signal was unambiguously observed when only the wavelength of the pump/probe light was scanned. By carefully examining the dependence of TRKR signal on the excitation wavelength and magnetic field as well as photoluminescence and reflectance spectra, the physical origin causing the sign change of the Kerr signal is uncovered. It is due to the resonant excitations of electrons with opposite spin orientations at heavy- (hh) and light-hole (lh) subbands, respectively, since there is a large enough energy separation in QDs for the excitation laser pulses. This measurement also leads to a precise determination of the energy separation between the hh and lh subbands near k 0 point in the dots. © 2011 American Institute of Physics. |
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Date de publication | 2011 |
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Dans | |
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Langue | anglais |
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Publications évaluées par des pairs | Oui |
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Numéro NPARC | 21271251 |
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Exporter la notice | Exporter en format RIS |
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Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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Identificateur de l’enregistrement | 531deb11-0128-407f-a451-54ed2108bb3c |
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Enregistrement créé | 2014-03-24 |
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Enregistrement modifié | 2020-04-21 |
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