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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Model for the light-induced magnetization in singly charged quantum dots

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Henriques, A. B. [1] ; Cordeiro, R. C. [1] ; Koenraad, P. M. [2] ; Otten, F. W. M. [2] ; Bayer, M. [3]
Total Authors: 5
[1] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo - Brazil
[2] Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven - Netherlands
[3] Tech Univ Dortmund, Expt Phys 2, D-44221 Dortmund - Germany
Total Affiliations: 3
Document type: Journal article
Source: Physical Review B; v. 91, n. 8 FEB 23 2015.
Web of Science Citations: 2

Magnetization is induced in an ensemble of quantum dots, each charged with a single electron, when it is illuminated with a short circularly polarized light pulse that is resonant with the fundamental energy gap of the quantum dots. In this investigation, a quantum-mechanical model for the light-induced magnetization is presented. The phase of the magnetization precession as a function of the strength of the magnetic field in a Voigt geometry is in excellent agreement with experimental data measured on (In,Ga)As singly charged quantum dot ensembles. It is demonstrated that the precession of the hole in the trion plays a vital role because it determines the amplitude and phase of the magnetization precession. The model could also be easily extended to describe positively charged quantum dots. We also suggest that our theory, combined with measurements of the phase as a function of magnetic field, can be used as a technique to measure the resonant trion lifetime as a function of QD emission energy. (AU)

FAPESP's process: 12/23406-0 - Optical investigation of spintronic systems
Grantee:Andre Bohomoletz Henriques
Support type: Regular Research Grants