Excitonic Dynamical Franz-Keldysh Effect

K. B. Nordstrom; K. Johnsen; S. J. Allen; A.-P. Jauho; B. Birnir; J. Kono; T. Noda; H. Akiyama; H. Sakaki

doi:10.1103/PhysRevLett.81.457

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

Phys. Rev. Lett. 81, 457 – Published 13 July 1998

Abstract

The dynamical Franz-Keldysh effect is exposed by exploring near-band-gap absorption in the presence of intense THz electric fields. It bridges the gap between the dc Franz-Keldysh effect and multiphoton 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 nonperturbatively via a nonequilibrium Green functions technique is able to describe the dynamical Franz-Keldysh effect in the presence of excitonic absorption.

Received 30 December 1997

DOI:https://doi.org/10.1103/PhysRevLett.81.457

Authors & Affiliations

K. B. Nordstrom¹, K. Johnsen^2,3, S. J. Allen¹, A.-P. Jauho², B. Birnir³, J. Kono⁴, T. Noda⁵, H. Akiyama⁵, and H. Sakaki^4,5

¹Center for Terahertz Science and Technology, Quantum Institute, University of California, Santa Barbara, California 93106
²Mikroelektronik Centret, Technical University of Denmark, Bldg 345east, DK-2800 Lyngby, Denmark
³Mathematics Department, University of California, Santa Barbara, California 93106
⁴Quantum Transition Project, Japan Science & Technology Corporation, Tokyo 153, Japan
⁵Institute of Industrial Science, University of Tokyo, Tokyo 106, Japan