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Phys. Rev. Lett. 81, 457 - 460 (1998)

Excitonic Dynamical Franz-Keldysh Effect

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K. B. Nordstrom1, K. Johnsen2,3, S. J. Allen1, A.-P. Jauho2, B. Birnir3, J. Kono4, T. Noda5, H. Akiyama5, and H. Sakaki4,5
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

Received 30 December 1997

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.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.81.457
DOI: 10.1103/PhysRevLett.81.457
PACS: 78.30.Fs, 71.35.Cc, 78.20.Bh, 78.66.Fd

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