Wannier-Stark effect in superlattices
作者： C Hamaguchi , M Yamaguchi , M Morifuji , H Kubo , K Taniguchi
DOI: 10.1088/0268-1242/9/11S/023
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摘要: Electroreflectance measurements have been carried out in order to investigate Stark-ladder transitions a GaAs (40 AA)/AlGaAs (20 AA) superlattice under various uniform electric fields, and compared with the transition energies calculated on basis of microscopic tight-binding theory. The observed electroreflectance spectra over wide range photon (1.5-2.2 eV) shift proportion an applied field. signals higher energy region (1.4-2.2 indicate existence from spin-orbit split-off band valence Wannier-Stark localization states conduction band. assignment is supported by calculation. Resonant coupling between localized also observed.
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