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Quasiresonant exciton spin orientation and alignment in a single quantum dot under zero and nonzero magnetic fields

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Title: Quasiresonant exciton spin orientation and alignment in a single quantum dot under zero and nonzero magnetic fields
Authors: Kaji, R. Browse this author
Adachi, S. Browse this author →KAKEN DB
Shindo, T. Browse this author
Muto, S. Browse this author
Issue Date: 15-Dec-2009
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 80
Issue: 23
Start Page: 235334
Publisher DOI: 10.1103/PhysRevB.80.235334
Abstract: The polarization conversion from optical orientation to alignment in single InAlAs/AlGaAs quantum dots (QDs) was studied in detail under zero and nonzero magnetic fields. Under the influence of the effective magnetic field, bright exciton doublets precess in pseudospin space, where the torque vector is composed of the external magnetic field and the anisotropic exchange field. For a number of QDs, we measured the angle difference of the polarization axes obtained with circularly polarized excitations, which is an indicator of the conversion efficiency under a zero magnetic field. By applying a longitudinal magnetic field, a high conversion efficiency of ∼50% was achieved. Additionally, the exciton spin-relaxation time and the magnitude of built-in linear dichroism were estimated from the exciton spin dynamics using the three-dimensional pseudospin precession model, and a long spin-relaxation time exceeding the recombination lifetime was obtained. Finally, we discussed the influence of a nuclear magnetic field on the polarization conversion.
Rights: ©2009 The American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 武藤 俊一

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