TY - JOUR
T1 - Theory of conductivity in superlattice minibands
AU - Yang, S. R.Eric
AU - Das Sarma, S.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1988
Y1 - 1988
N2 - We have calculated the impurity-scattering limited electrical conductivity for vertical transport in superlattice minibands. For sufficiently small carrier density and/or large disorder the collisional broadening () can be larger than the chemical potential. In such situations the quasiparticle approximation breaks down, and use of the conventional Bloch-Boltzmann transport theory is unreliable. Also, as the period of the superlattice increases, the ratio ()/ grows, resulting in a reduction of the mobility, leading eventually to Anderson localization. In addition, the carriers in the miniband become nondegenerate already at low temperatures, giving rise to a significant temperature dependence of the mobility. Furthermore, due to the unique shape of the Fermi surface of the superlattice the mobility becomes independent of the carrier density when the chemical potential exceeds the miniband width.
AB - We have calculated the impurity-scattering limited electrical conductivity for vertical transport in superlattice minibands. For sufficiently small carrier density and/or large disorder the collisional broadening () can be larger than the chemical potential. In such situations the quasiparticle approximation breaks down, and use of the conventional Bloch-Boltzmann transport theory is unreliable. Also, as the period of the superlattice increases, the ratio ()/ grows, resulting in a reduction of the mobility, leading eventually to Anderson localization. In addition, the carriers in the miniband become nondegenerate already at low temperatures, giving rise to a significant temperature dependence of the mobility. Furthermore, due to the unique shape of the Fermi surface of the superlattice the mobility becomes independent of the carrier density when the chemical potential exceeds the miniband width.
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U2 - 10.1103/PhysRevB.37.10090
DO - 10.1103/PhysRevB.37.10090
M3 - Article
AN - SCOPUS:0000425150
SN - 0163-1829
VL - 37
SP - 10090
EP - 10094
JO - Physical Review B
JF - Physical Review B
IS - 17
ER -