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Study of the Two‐Dimensional to Quasi‐Three‐Dimensional Transition in GaAs/AlAs Superlattices by Polarized Hot Photoluminescence
Author(s) -
Sapega V. F.,
Perel V. I.,
Dobin A. Yu.,
Mirlin D. N.,
Akimov I. A.,
Ruf T.,
Cardona M.,
Eberl K.
Publication year - 1997
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 - 10.1002/1521-3951(199711)204:1<141::aid-pssb141>3.0.co;2-i
Subject(s) - superlattice , polarization (electrochemistry) , condensed matter physics , electron , anisotropy , photoluminescence , magnetic field , hot electron , physics , linear polarization , materials science , chemistry , optics , quantum mechanics , laser
We have studied the effect of miniband formation on the polarization properties of hot electron photoluminescence (HEL) in GaAs/AlAs superlattices (SLs). We found that miniband formation in GaAs/AlAs SL is accompanied by strong changes in polarization of the HEL. The quasi‐3D motion of electrons in SL results in a dependence of the HEL polarization on their ratio of lateral and miniband kinetic energy. We discuss the effect of a magnetic field on the linear HEL polarization. Measurements in the Voigt geometry clearly demonstrate that the momentum distribution of photogenerated electrons is strongly anisotropic. We present a theory of the HEL polarization in SLs and its magnetic field dependence which explains these observations.