Spin-induced optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe
B. Kaminski, M. Lafrentz, R. V. Pisarev, D. R. Yakovlev, V. V. Pavlov,, V.A. Lukoshkin, A. B. Henriques, G. Springholz, G. Bauer, E. Abramof, P. H., O. Rappl, and M.Bayer
TL;DR
This paper demonstrates spin-induced optical second harmonic generation in centrosymmetric magnetic semiconductors EuTe and EuSe, revealing a novel magnetic dipole contribution to nonlinear optical susceptibility influenced by magnetic fields and temperature.
Contribution
It introduces a new type of nonlinear optical susceptibility caused by magnetic dipole effects in centrosymmetric magnetic semiconductors.
Findings
SHG observed near 2.1-2.4 eV in EuTe and EuSe
SHG depends on magnetic field and temperature
Spin-induced susceptibility enables new spectroscopy approaches
Abstract
Spectroscopy of the centrosymmetric magnetic semiconductors EuTe and EuSe reveals spin-induced optical second harmonic generation (SHG) in the band gap vicinity at 2.1-2.4eV. The magnetic field and temperature dependence demonstrates that the SHG arises from the bulk of the materials due to a novel type of nonlinear optical susceptibility caused by the magnetic dipole contribution combined with spontaneous or induced magnetization. This spin-induced susceptibility opens access to a wide class of centrosymmetric systems by harmonics generation spectroscopy.
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