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Two‐Band Envelope Function Model for Graded Interfaces
Author(s) -
RodríguezCoppola H.,
MartínezCuellar J. L.,
PérezÁlvarez R.
Publication year - 1990
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.2221580209
Subject(s) - superlattice , sawtooth wave , envelope (radar) , simple (philosophy) , condensed matter physics , band gap , function (biology) , electronic band structure , electron , electronic band , materials science , physics , quantum mechanics , computer science , evolutionary biology , biology , philosophy , epistemology , computer vision , telecommunications , radar
An analytical calculation is given of the energy minibands of a superlattice with graded interfaces and the sawtooth superlattice applying a simple two band model to describe electrons in coduction band and light holes, and a single band equation for heavey holes with good agreement with calculations reported before. The effective energy gap in the superlattice with graded layers as a function of the thickness of the graded interfaces shows a different behavior than reported before for small superlattice period. It is shown that with simple enough envelope function models such composite graded systems can be treated with good results.