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Title: Shot noise of charge current in a quantum dot responded by rotating and oscillating magnetic fields

We have investigated the shot noise and Fano factor of the dynamic spin-polarized quantum dot under the perturbations of a rotating magnetic field (RMF), and an oscillating magnetic field (OMF) by employing the non-equilibrium Green's function approach. The shot noise is enhanced from sub-Poissonian to super-Poissonian due to the application of RMF and OMF, and it is controlled sensitively by the tilt angle θ of RMF. The magnitude of shot noise increases as the photon energy ℏω of OMF increases, and its valley eventually is reversed to peaks as the photon energy is large enough. Double-peak structure of Fano factor is exhibited as the frequency of OMF increases to cover a large regime. The Zeeman energy μ{sub 0}B{sub 0} acts as an effective gate bias to exhibit resonant behavior, and novel peak emerges associated with the applied OMF.
Authors:
;  [1] ;  [2]
  1. School of Physics, Beijing Institute of Technology, Beijing 100081 (China)
  2. Department of Maths and Physics, Hunan Institute of Engineering, Xiangtan 411104 (China)
Publication Date:
OSTI Identifier:
22314386
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DISTURBANCES; EQUILIBRIUM; FANO FACTOR; GREEN FUNCTION; MAGNETIC FIELDS; NOISE; PERTURBATION THEORY; PHOTONS; QUANTUM DOTS; SPIN ORIENTATION; ZEEMAN EFFECT