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Effect of Quantum confinement on impurity hopping in quantum wells
Author(s) -
Keiper R.,
Wang W.,
Zvyagin I. P.
Publication year - 1996
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.2221930111
Subject(s) - bohr radius , impurity , condensed matter physics , radius , conductance , quantum well , physics , quantum dot , position (finance) , quantum , quantum mechanics , laser , computer security , computer science , finance , economics
The problem of evaluation of the impurity hopping conductance in quantum wells is discussed, taking account of the impurity position‐dependent shifts of the binding energies and the variation of the localization radii. It is demonstrated that these effects give rise to a temperature dependence of the conductance of the form σ = σ 0 exp {−(T 0 /T) 1/3 }, where the parameter T 0 depends on the well width L. Numerical calculations using the variational principle show that this dependence is strong for strongly compensated samples in the region of L/a* ≦ 1, where a* is the effective Bohr radius.