Excitonic Dynamical Franz-Keldysh Effect

Details Excitonic Dynamical Franz-Keldysh Effect Excitonic Dynamical Franz-Keldysh Effect

1998-04-23

arxiv.org/abs/cond-mat/9804254v1

Phys. Rev. Lett. Vol. 81, 457 (1998).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages in revtex with 5 figures included using epsf. Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.81.457

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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