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N Suzumura,M. Yamaguchi,N. Sawaki,Y. Nishimoto 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The intersubband relaxation processes of electrons in GaAs/AlGaAs mesoscopic disks were investigated by femtosecond reflectance spectroscopy. It was found that the relaxation time in a mesoscopic disk is on the order of sub-picosecond and depends on the shape of the disk. Under the lowest excitation intensity where the relaxation time is independent of the excitation intensity, the LO phonon emission rate is lower than that expected in a bulk GaAs. Moreover the time constant depended on the shape of the disk. A possible origin of the suppression of LO phonon emission rate is discussed from the point of the modification of the scattering cross section in a disk of mesoscopic size.