https://doi.org/10.1140/epjb/e2011-10731-0
Shot noise in a double-quantum-dot Aharonov-Bohm interferometer under the perturbation of ac fields
Key Laboratory of Cluster Science of Ministry of
Education, and Department of Physics, Beijing Institute of
Technology, Beijing, 100081, P.R. China
Corresponding author: a zhaohonk@yahoo.com
Received:
23
September
2010
Revised:
25
December
2010
Published online:
21
February
2011
We have investigated the shot noise spectral density in the parallel double-quantum-dot (DQD) interferometer threaded with an Aharonov-Bohm (AB) flux under the perturbation of ac fields. The derivations are based on the nonequilibrium Green's function (NGF) technique in the Coulomb blockade regime. The AB flux and the perturbation of ac fields together provide a photon-assisted AB interferometer for controlling the shot noise efficiently. The signature of the shot noise reflects the intrinsic microstructure of the DQD system, which plays important roles for the enhancement and suppression of shot noise. The versatile resonant structures of shot noise, Fano factor have been revealed to exhibit the sub-Poissonian and super-Poissonian types of shot noise by adjusting the gate voltages sequentially.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011