Quantum Open-Systems Approach to Current Noise in Resonant Tunnelling Junctions

Details Quantum Open-Systems Approach to Current Noise in Resonant Tunnelling Junctions Quantum Open-Systems Approach to Current Noise in Resonant Tunnelling Junctions

1998-10-07

arxiv.org/abs/cond-mat/9810067v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

23 pages, 4 postscript figures

Scientific paper

A quantum Markovian master equation is derived to describe the current noise in resonant tunnelling devices. This equation includes both incoherent and coherent quantum tunnelling processes. We show how to obtain the population master equation by adiabatic elimination of quantum coherences in the presence of elastic scattering. We calculate the noise spectrum for a double well device and predict sub-shot noise statistics for strong tunnelling between the wells. The method is an alternative to Green's functions methods, and population master equations for very small coherently coupled quantum dots.

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