Theory of near-gap second harmonic generation in centrosymmetric magnetic semiconductors: Europium chalcogenides | Zendy

A. B. Henriques | Zendy; E. Abramof | Zendy; P. H. O. Rappl | Zendy

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Theory of near-gap second harmonic generation in centrosymmetric magnetic semiconductors: Europium chalcogenides

Author(s) -

A. B. Henriques,

E. Abramof,

P. H. O. Rappl

Publication year - 2009

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.80.245206

Subject(s) - excitation , physics , harmonics , magnetic dipole , condensed matter physics , dipole , excited state , magnetic field , semiconductor , second harmonic generation , harmonic , europium , atomic physics , optics , quantum mechanics , voltage , luminescence , laser

Second harmonic generation is strictly forbidden in centrosymmetric materials, within the electric dipole approximation. Recently, it was found that the centrosymmetric magnetic semiconductors EuTe and EuSe can generate near-gap second harmonics, if the system is submitted to an external magnetic field. Here, a theoretical model is presented, which well describes the observed phenomena. The model shows that second harmonic generation becomes efficient when the magnetic dipole oscillations between the band-edge excited states of the system, induced by the excitation light, enter the in-phase regime, which can be achieved by applying a magnetic field to the material.FAPESPCNPq(DAAD) Deutscher Akademischer Austausch Dienst, German

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