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First‐Order Quantum Corrections to the Diffusivity and Current‐Induced Density Fluctuations in the Three‐Dimensional Bulk
Author(s) -
Lenk R.
Publication year - 1989
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.2221540232
Subject(s) - superposition principle , thermal diffusivity , density matrix , physics , quantum , energy current , uncorrelated , current (fluid) , diffusion , statistical physics , quantum fluctuation , current density , representation (politics) , condensed matter physics , quantum mechanics , energy (signal processing) , quantum electrodynamics , mathematics , statistics , politics , political science , law , thermodynamics
Employing a superposition representation of the density matrix for a fixed energy, the first order quantum corrections to the diffusivity are calculated for independent charge carriers scattered by uncorrelated point‐like scatterers. It is shown how fluctuations in carrier density, especially those which are caused by the current itself, contribute to the quantum corrections.