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Title: Photon assisted tunneling through three quantum dots with spin-orbit-coupling

The effect of an ac electric field on quantum transport properties in a system of three quantum dots, two of which are connected in parallel, while the third is coupled to one of the other two, is investigated theoretically. Based on the Keldysh nonequilibrium Green's function method, the spin-dependent current, occupation number, and spin accumulation can be obtained in our model. An external magnetic flux, Rashba spin-orbit-coupling (SOC), and intradot Coulomb interactions are considered. The magnitude of the spin-dependent average current and the positions of the photon assisted tunneling (PAT) peaks can be accurately controlled and manipulated by simply varying the strength of the coupling and the frequency of the ac field. A particularly interesting result is the observation of a new kind of PAT peak and a multiple-PAT effect that can be generated and controlled by the coupling between the quantum dots. In addition, the spin occupation number and spin accumulation can be well controlled by the Rashba SOC and the magnetic flux.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [4]
  1. College of Physical Science and Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024 (China)
  2. School of Sciences, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018 (China)
  3. (Hong Kong)
  4. (China)
Publication Date:
OSTI Identifier:
22314604
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 6; 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; ELECTRIC FIELDS; GREEN FUNCTION; L-S COUPLING; MAGNETIC FLUX; OCCUPATION NUMBER; PHOTONS; QUANTUM DOTS; SPIN; TUNNEL EFFECT