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Exciton Parameters and Electron Miniband Structure of GaAs/AlGaAs Superlattices
Author(s) -
Uraltsev I. N.,
Ivchenko E. L.,
Kopev P. S.,
Kochereshko V. P.,
Yakovlev D. R.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221500252
Subject(s) - condensed matter physics , exciton , electron , magnetic field , superlattice , polarization (electrochemistry) , linear polarization , spin polarization , materials science , physics , chemistry , laser , optics , quantum mechanics
Abstract The linear optical properties of short‐period GaAs/AlGaAs superlattices (SL) with three‐dimensional conduction minibands are studied. Using spectroscopy of p‐polarized reflectance at oblique incidence the enhancement of exciton resonance features and effect of lineshape inversion at Brewster angle for the first time are observed. The heavy‐ and light‐hole exciton oscillator strength is found to decrease with shortening of the SL period. Using the optical orientation technique the splitting of electron minibands linear in wave vector is measured for the first time. An essential increase of the photoelectron spin polarization is observed in the presence of magnetic field in Faraday configuration. The magnetic field effect is described in terms of the suppression of the electron spin relaxation connected with the k ‐linear splitting of miniband spin states.