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Applied Physics Letters / Volume 97 / Issue 21 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 97, 211902 (2010); http://dx.doi.org/10.1063/1.3518483 (3 pages)

Dynamical Franz–Keldysh effect in GaAs/AlGaAs multiple quantum wells induced by single-cycle terahertz pulses

K. Shinokita1, H. Hirori2,3, M. Nagai1, N. Satoh4, Y. Kadoya3,4, and K. Tanaka1,2,3

1Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
2Institute for Integrated Cell-Material Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
3CREST, Japan Science and Technology Agency, 4-1-8, Kawaguchi, Saitama 332-0012, Japan
4Department of Quantum Matter, Hiroshima University, Kagamiyama, Higashihiroshima 739-8530, Japan

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(Received 19 September 2010; accepted 29 October 2010; published online 22 November 2010)

We studied absorption spectra near the band gap of GaAs/AlGaAs multiple quantum wells subjected to strong single-cycle terahertz pulses. With an increasing terahertz electric field, the heavy-hole 1s exciton energy near the band gap redshifts, reaches a maximum, and turns to blueshift. The blueshift increases proportionally to the ponderomotive energy, i.e., the terahertz electric field squared, which differs from the response expected from the Frantz–Keldysh effect (FKE) in a dc electric field. This fact suggests that the observed ponderomotive energy dependence of the blueshift can be ascribed to the dynamical FKE.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium compounds, electro-optical effects, energy gap, excitons, gallium arsenide, high-frequency effects, III-V semiconductors, semiconductor quantum wells, spectral line shift, terahertz wave spectra

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3518483

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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