Publication: Quasi-ballistic-electron transport in random superlattices
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ISSN: 1098-0121 (print version)
ISSN: 1550-235X (online version)
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1994-12-15
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American Physical Society
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Abstract
We theoretically study electron transport in disordered, quantum-well-based, semiconductor superlattices
with structural short-range correlations. Our system consists of equal-width square barriers and quantum wells
with two different thicknesses. The two kinds of quantum wells are randomly distributed along the growth
direction. Structural correlations are introduced by adding the constraint that one of the wells always appears
in pairs. We show that such correlated disordered superlattices exhibit a strong enhancement of their dc
conductance as compared to usual random ones, giving rise to quasi-ballistic-electron transport. Interestingly,
this phenomenon is also detected in superlattices with random fluctuations of the well thicknesses. Our predictions
can be used to demonstrate experimentally that structural correlations inhibit the localization effects of
disorder and, most important, that it should be clearly observed even in the presence of imperfections
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Physical Review B, vol. 50, n. 23, 15 dec. 1994. Pp. 17 736–17 739