High-frequency Franz-Keldysh effect on excitons

Abstract

When the effective characteristic electro-optic energy h{stroke}|Λ H|, which is obtained by including the electron-hole interaction in the solid, is very large compared to h{stroke}ω of the modulating electric field, the line shapes of the field-induced change of dielectric function are the same as those of Franz-Keldysh effect. However, in the low-field and high-frequency limit Δ∈ 2(Ω, E is nearly proportional to the first derivative of the unperturbed dielectric function. It is different from the low-field and low-frequency limit case where Δ∈ 2(Ω, E) is proportional to the third derivative of the unperturbed dielectric function. © 1973.