Excitonic Dynamical Franz-Keldysh Effect
K. B. Nordstrom, K. Johnsen, S. J. Allen, A.-P. Jauho, B. Birnir, J., Kono, T. Noda, H. Akiyama, and H. Sakaki
TL;DR
This paper investigates the Dynamical Franz-Keldysh Effect in excitonic materials under intense THz fields, introducing a theoretical model that captures the non-perturbative effects and bridges existing phenomena like the DC Franz-Keldysh and multi-photon absorption.
Contribution
It presents a novel non-equilibrium Green functions model that accurately describes the excitonic Dynamical Franz-Keldysh Effect under strong THz fields.
Findings
The model captures the energy shifts of excitonic resonances due to intense THz fields.
It demonstrates the competition between the Dynamical Franz-Keldysh Effect and the AC Stark Effect.
The results unify understanding of near-bandgap absorption phenomena under strong fields.
Abstract
The Dynamical Franz-Keldysh Effect is exposed by exploring near-bandgap absorption in the presence of intense THz electric fields. It bridges the gap between the DC Franz- Keldysh effect and multi-photon absorption and competes with the THz AC Stark Effect in shifting the energy of the excitonic resonance. A theoretical model which includes the strong THz field non-perturbatively via a non-equilibrium Green Functions technique is able to describe the Dynamical Franz-Keldysh Effect in the presence of excitonic absorption.
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