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P: Plasmaphysik

P 10: Theory and Plasma Diagnostic (Poster Session)

P 10.6: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT2

Nonlinear relaxation field in charged systems under high electric fields — •K. Morawetz — Max-Planck-Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany

The influence of an external electric field on the current in charged systems is investigated. The results beyond linear response from the classical hierarchy of density matrices are compared with the results from the quantum kinetic theory. It is found that an even infinitesimal friction with a background changes the results in a non-continuous way. The kinetic theory yields a systematic treatment of the nonlinear current beyond linear response. To this end the dynamically screened and field-dependent Lenard-Balescu equation is integrated analytically and the nonlinear relaxation field is calculated. The classical linear response result known as Debye - Onsager relaxation effect is only obtained if asymmetric screening is assumed. Considering the kinetic equation of one specie the other species have to be screened dynamically while the screening with the same specie itself has to be performed statically. Different other approximations are discussed and compared.
Physical Review E 62 (2000), 6135: Nonlinear relaxation field in charged systems under high electric fields, K. Morawetz