Tuning Excess Noise by Aharonov-Bohm Interferometry

Details Tuning Excess Noise by Aharonov-Bohm Interferometry Tuning Excess Noise by Aharonov-Bohm Interferometry

2010-03-25

arxiv.org/abs/1003.5011v2

Chem. Phys. 375, 291 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures, final version, corrected typos and updated references

Scientific paper

10.1016/j.chemphys.2010.03.028

A voltage bias applied to a conductor induces a change of the current noise with respect to the equilibrium noise known as excess noise. We analyze the excess noise of the electronic current flowing through a mesoscopic Aharonov-Bohm ring threaded by a magnetic flux, coupled to a side gate, and contacted by two metallic electrodes. It is shown that the excess noise can be controlled both magnetically and electrostatically, demonstrating the full tunability of the system. At zero frequency, the ratio of the noise strength to the current (Fano factor) can thereby be minimized. Remarkably, at finite frequency, regions of negative excess noise emerge.

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