Shot noise in nano-electronic systems under the perturbation of ac fields |
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Authors: | Zhao Hong-kang |
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Institution: | (1) Department of Physics, Beijing Institute of Technology, Beijing, 100081, China |
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Abstract: | Current noise exists in circuits and electronic devices generally, and it exhibits specific features as the system reaches
nanometer size. The noise in the nano-system where external ac fields are applied plays an important role, since the properties
of the fields and the nano-system together govern the resulting noise. In this paper, we present the derivation of shot noise
by employing the non-equilibrium Green’s function technique. The more general formulas for the current correlation and noise
spectral density are given. The system is composed of a central nanosystem coupled to electrodes, and the obtained noise formulas
are related to the Green’s functions of detailed central regime and the terminals. As an example, we have performed the numerical
calculation on a system with a toroidal carbon nanotube coupled to normal metal leads. The noise and Fano factor show intimate
relation with the structure of the system and ac fields. The Aharonov-Bohm-like behaviors on the shot noise spectral density
and Fano factor are observed to exhibit oscillation structures with period of quantum flux.
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Keywords: | shot noise current correlation mesoscopic system carbon nanotube |
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