Phys. Rev. Lett. 81, 457–460 (1998)

Excitonic Dynamical Franz-Keldysh Effect

Abstract

References

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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

Received 30 December 1997; published in the issue dated 13 July 1998

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.

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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Phys. Rev. Lett. 81, 457–460 (1998)

Excitonic Dynamical Franz-Keldysh Effect