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Effect of Spatially Disordered Barriers on the Band Structure of Finite Superlattices
Author(s) -
Nimour S. M. A.,
Ouasti R.,
Zekri N.
Publication year - 1998
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/(sici)1521-3951(199810)209:2<311::aid-pssb311>3.0.co;2-g
Subject(s) - superlattice , condensed matter physics , delocalized electron , band gap , electronic band structure , transmission coefficient , physics , eigenvalues and eigenvectors , exponent , transmission (telecommunications) , quantum mechanics , engineering , electrical engineering , linguistics , philosophy
We use a Kronig‐Penney (KP) model with randomly distributed well widths to study the effect of spatial disorder on the band spectrum of superlattices by means of the transmission coefficient and the Lyapunov exponent. It is mainly found that the eigenstates in the allowed miniband become localized while in the gap edge there is a delocalization contributing to the broadening of the allowed miniband of the corresponding ordered superlattice. The effect of disorder on the T – V curves is also examined. We found that the Stark localization behaves differently in the gap and in the allowed band and tends to be suppressed. Further discussion and comparison with other theoretical and experimental investigations are also provided.