Terahertz Emission due to Miniband Transport in GaAs/AlGaAs Superlattices
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概要
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We have investigated terahertz (THz) emission due to miniband transport of electrons in biased GaAs/AlGaAs superlattice diodes by time-resolved THz spectroscopy. Quasi-autocorrelation measurements were performed on the emitted THz electromagnetic wave using a bolometer as a wideband detector. We found that the THz emission due to miniband transport is strongly dependent on the photon energy of the pump laser pulses. A clear oscillation in the THz autocorrelation signal due to Bloch oscillation has been observed by exciting the sample at a photon energy slightly lower than the center of the Wannier-Stark ladder even for a superlattice with a miniband width larger than the longitudinal optical (LO) phonon energy. Furthermore, transient velocities of electrons in the miniband have been estimated from the measured THz autocorrelation signal.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 2001-04-30
著者
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Shimada Yozo
Institute Of Industrial Science University Of Tokyo
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Matsuno Tetsuya
Institute Of Industrial Sciences University Of Tokyo
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Hirakawa Kazuhiko
Institute of Industrial Science and INQIE, University of Tokyo, Meguro, Tokyo 153-8505, Japan
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Hirakawa Kazuhiko
Institute of Industrial Sciences, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo 106-8558, Japan
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Matsuno Tetsuya
Institute of Industrial Sciences, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo 106-8558, Japan
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Shimada Yozo
Institute of Industrial Sciences, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo 106-8558, Japan
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