AC shot noise through a vibrating quantum dot |
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Authors: | K-H Yang and C-Z Liu |
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Institution: | 1.College of Applied Sciences, Beijing University of Technology,Beijing,P.R. China |
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Abstract: | In this paper we investigate the joint effects of the
electron-phonon interaction and an external alternating (ac) gate voltage
on the spectral density of shot noise through a vibrating quantum
dot system, by applying the Lang-Firsov canonical transformation and
the Keldysh nonequilibrium Green's function (NGF) technique. We find
that the effects of the electron-phonon and electron-photon interaction
on the differential shot noise are different. The main resonant peak of
the differential shot noise is decreased only when a time-dependent gate
voltage is imposed on quantum dot. With the ac field amplitude increasing,
the main resonant peak of the differential shot noise decreases. The Fano
factor of the system, which exhibits the deviation of shot noise from the
Schottky formula, is also studied. Super-Poissonian shot noise appears due
to the photon absorption (emission) processes in the low bias voltage region. |
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Keywords: | |
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