Abstract
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/t2 decay law for the current correlation function. At finite temperature, this singularity is smoothed out.
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