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Interband Transition Strength and Magneto‐Absorption Spectrum in Type‐I Superlattices in In‐Plane Magnetic Fields
Author(s) -
Gondar J. López,
da Costa B. A. S.,
Dickstein F.
Publication year - 1995
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.2221870112
Subject(s) - superlattice , magnetic field , envelope (radar) , condensed matter physics , cyclotron , physics , saturation (graph theory) , type (biology) , quantum mechanics , mathematics , combinatorics , computer science , ecology , biology , telecommunications , radar
Using a simplified parabolic band model approach within the framework of the envelope function approximation, the influence of in‐plane magnetic fields on the electronic and optical properties of type‐I superlattices is studied. The results are in qualitative agreement with experimental facts previously reported, as well as with previous theoretical results obtained using more elaborated and toilsome methods. Furthermore, this approach allows to advance, in a great extent, in the analytical treatment of interband transitions, leading straightforwardly to some general conclusions. The not well understood case of high magnetic field effects (magnetic length comparable with the superlattice period) is studied in detail. There strong variations of the interband transition strengths as function of the cyclotron orbit center position are found, a fact which is directly connected with the broadening and final saturation of the magneto‐absorption spectrum with increasing fields. A consistent explanation of such strong variations is given in terms of magnetic subband mixing.