Abstract

Photocurrent spectroscopy in lattice matched In 0:53 Ga 0:47 As/In 0:52 Al 0:48 As multi-quantum wells structures were measured at room temperatures. Step-like structures accentuated by the exciton peaks of interband transitions were observed on photocurrent spectra. The exciton peaks clearly appeared at lower quantum numbers and do not appear at higher quantum number. It might be caused that the electron eigen-states become subbands having with energy width in the periodic finite potential.

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