Optical third harmonic generation in the magnetic semiconductor EuSe

Third harmonic generation (THG) has been studied in europium selenide EuSe in the vicinity of the band gap at 2.1-2.6 eV and at higher energies up to 3.7 eV. EuSe is amagnetic semiconductor crystalizing in centrosymmetric structure of rock-salt type with the point group m3m. For this symmetry the crystallographic and magnetic-field-induced THG nonlinearities are allowed in the electric-dipole approximation. Using temperature, magnetic field, and rotational anisotropy measurements, the crystallographic and magnetic-field-induced contributions to THG were unambiguously separated. Strong resonant magnetic-field-induced THG signals were measured at energies in the range of 2.1-2.6 eV and 3.1-3.6 eV for which we assign to transitions from 4 f(7) to 4 f(6)5d(1) bands, namely involving 5d(t(2g)) and 5d(e(g)) states.

Deutsche Forschungsgemeinschaft [YA65/4-1]

Deutsche Forschungsgemeinschaft

Russian Foundation for Basic Research

Russian Foundation for Basic Research [10-02-01008]

Russian Academy

Russian Academy

FoNE of the European Science Foundation

FoNE of the European Science Foundation

FAPESP

FAPESP

CNPq

CNPq

Deutscher Akademischer Austausch Dienst (DAAD)

Deutscher Akademischer Austauschdienst (DAAD)

FWF, Vienna, Austria [I80-N20]

FWF, Vienna, Austria