Current-induced break of inversion symmetry in Si: optical second-harmonic generation induced by a dc current

Abstract

The dc-current-induced optical second-harmonic generation is observed at the surface of centrosymmetric single crystal of Si. Surface dc-current with density up to ${\text{j}}_{max}\sim 10^3$ A/cm${}^2$ results in break of inversion symmetry of Si and induces optical second-harmonic generation with intensity that corresponds to the appearance of dipole second-order susceptibility ${\chi }^{(2)d}(j_{max})\sim 3\cdot 10^{-15}$m/V.