Generalized gradient expansions in quantum transport equations
Abstract
Gradient expansions in quantum transport equations of a KadanoffBaym form have been reexamined. In a consistent approach the expansion should be performed also inside the selfenergy in the scattering integrals of these equations. In the first perturbation order this internal expansion gives new correction terms to the generalized Boltzmann equation. These correction terms are found here for several typical systems. Possible corrections to the theory of a linear response to weak electric fields are also discussed.
 Publication:

Journal of Statistical Physics
 Pub Date:
 March 1997
 DOI:
 10.1007/BF02183626
 arXiv:
 arXiv:condmat/9611142
 Bibcode:
 1997JSP....86.1337K
 Keywords:

 Condensed Matter  Statistical Mechanics
 EPrint:
 20 pages, latex, to appear in Journal of Statistical Physics, March (1997)