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[文献書誌] K.Yamanaka and K.Hirakawa: "Far Infrared Photoresponse of the Diagonal Magnetoresistance of the Two-Dimensional Electron System near the n=1 Spin-Gap Quantum Hall State" Physica Status Solidi(B). 204. 310-313 (1998)
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[文献書誌] K.Yamanaka and K.Hirakawa: "Far-infrared photoresponse of the AlGaAs/GaAs low-dimensional systems constricted by split-gates" Solid-State Electronics. 42,7-8. 1151-1153 (1998)
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[文献書誌] N.Sekine,K.Yamanaka,K.Hirakawa,M.Vosseburger,P.Haring-Bolivar,and H.Kurz: "Observation of teraherz radiation from higher-order two-dimensional plasmon modes in GaAs/AlGaAs single quantum wells" Applied Physics Letters. vol.74,No.7. 1006-1008 (1999)
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[文献書誌] N.Sekine,K.Hirakawa,and Y.Arakawa: "Terahertz emission from quantum beats in coupled quantum wells" Japanese Journal of Applied Physics. vol.37,part.1,No.3B. 1643-1645 (1998)
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[文献書誌] Y.Shimada and K.Hirakawa: "Optical and transport properties of single quantum well infrared photodetectors" Japanese Journal of Applied Physics. vol.37,part 1,No.3B. 1421-1423 (1998)
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[文献書誌] Y.Shimada,K.Hirakawa: "Photocurrent dynamics in single quantum well infrared photodetectors investigated by using free electron laser pulses" Nuclear Instruments and Methods in Physics Research. B 144. 166-171 (1998)
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[文献書誌] K.Hirakawa(分担執筆): "Terahertz Spectroscopy of Semiconductor Nanostructures" Springer, 96-103 (1998)