Artículos de revistas
Theory of near-gap second harmonic generation in centrosymmetric magnetic semiconductors: Europium chalcogenides
Fecha
2009Registro en:
PHYSICAL REVIEW B, v.80, n.24, 2009
1098-0121
10.1103/PhysRevB.80.245206
Autor
Henriques, Andre Bohomoletz
ABRAMOF, E.
RAPPL, P. H. O.
Institución
Resumen
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.