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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe

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Autor(es):
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Kaminski, B. [1] ; Lafrentz, M. [1] ; Pisarev, R. V. [2] ; Yakovlev, D. R. [1, 2] ; Pavlov, V. V. [2] ; Lukoshkin, V. A. [2] ; Henriques, A. B. [3] ; Springholz, G. [4] ; Bauer, G. [4] ; Abramof, E. [5] ; Rappl, P. H. O. [5] ; Bayer, M. [1]
Número total de Autores: 12
Afiliação do(s) autor(es):
[1] Tech Univ Dortmund, D-44221 Dortmund - Germany
[2] Russian Acad Sci, AF Ioffe Phys Tech Inst, St Petersburg 194021 - Russia
[3] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
[4] Johannes Kepler Univ Linz, Inst Halbleiter & Festkorperphys, A-4040 Linz - Austria
[5] LAS INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 81, n. 15 APR 15 2010.
Citações Web of Science: 14
Assunto(s):Filmes finos   Polarização   Epitaxia por feixe molecular
Resumo

The magnetic europium chalcogenide semiconductors EuTe and EuSe are investigated by the spectroscopy of second harmonic generation (SHG) in the vicinity of the optical band gap formed by transitions involving the 4f and 5d electronic orbitals of the magnetic Eu(2+) ions. In these materials with centrosymmetric crystal lattice the electric-dipole SHG process is symmetry forbidden so that no signal is observed in zero magnetic field. Signal appears, however, in applied magnetic field with the SHG intensity being proportional to the square of magnetization. The magnetic field and temperature dependencies of the induced SHG allow us to introduce a type of nonlinear optical susceptibility determined by the magnetic-dipole contribution in combination with a spontaneous or induced magnetization. The experimental results can be described qualitatively by a phenomenological model based on a symmetry analysis and are in good quantitative agreement with microscopic model calculations accounting for details of the electronic energy and spin structure. (AU)

Processo FAPESP: 08/09753-3 - Detecção e controle óptico do magnetismo em semicondutores magnéticos e quantum dots
Beneficiário:Andre Bohomoletz Henriques
Linha de fomento: Auxílio à Pesquisa - Regular