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Nonlinear quantum transport and current noise
Author(s) -
Lang Gunther,
Weiss Ulrich
Publication year - 2000
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/1521-3889(200010)9:9/10<804::aid-andp804>3.0.co;2-e
Subject(s) - nonlinear system , noise (video) , quantum , current (fluid) , physics , quantum noise , statistical physics , quantum mechanics , computer science , artificial intelligence , image (mathematics) , thermodynamics
We study nonequilibrium transport and noise in a genericdissipative tightbinding model. Within a real‐time path integral approach, we derive formally exact series expressions in the number of tunneling events for the noise valid for arbitrary bias, frequency and temperature. At zero temperature, the low‐frequency noise can be summed in analytic form.The resulting Shiba‐like | ω |‐singularity is a consequence of the 1/ t 2 decay law for the current correlation function. At finite temperature, this singularity is smoothed out.