Analytical theory for the time-resolved dynamical Franz-Keldysh effect under circularly polarized light

TL;DR

This paper derives an analytical formula for the time-resolved dynamical Franz-Keldysh effect under circularly polarized light, revealing unique sub-cycle optical property changes distinct from the linear polarization case.

Contribution

It provides the first analytical expression for the Tr-DFKE under circular polarization, highlighting differences from the linear case and advancing theoretical understanding.

Findings

Sub-cycle change of optical properties disappears under circular polarization

The formula shows differences from the static Franz-Keldysh effect

Highlights the role of polarization in ultrafast optical phenomena

Abstract

We report here the analytical formula for the time-resolved dynamical Franz-Keldysh effect (Tr-DFKE) under circularly polarized light. We assume the Houston function as the time-dependent wave function of the parabolic two-band system. Our formula shows that the sub-cycle change of the optical properties disappears, which is a significant feature of the Tr-DFKE under linear polarized light and is different from the static Franz-Keldysh effect.