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Title: Spin polarized current from multiply-coupled rings with Zeeman-split quantum dots

We investigate transmission resonances and conductance properties of multiple, serially connected, direct-contact nanoscale rings using the tight-binding model. Quantum dots (QDs) are embedded in the two arms of each ring, and Zeeman-splitting of the QD energy levels is incorporated into the system Hamiltonian. Transmission bands develop as the number of rings in series increases, with a band-gap which is sensitive to the degree of Zeeman splitting and the initial settings of the QD site energy values. The current vs. voltage characteristics of the system can be modulated between Ohmic and semiconducting as a function of the Zeeman splitting. In addition, spin-polarized current results for selected ranges of the Fermi energy.
Authors:
;  [1]
  1. Center for Computational Nanoscience, Department of Physics and Astronomy, Ball State University, Muncie, Indiana 47306 (United States)
Publication Date:
OSTI Identifier:
22271212
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ELECTRIC CONDUCTIVITY; ELECTRIC CURRENTS; ELECTRONIC STRUCTURE; ENERGY GAP; ENERGY LEVELS; HAMILTONIANS; QUANTUM DOTS; RESONANCE; SPIN ORIENTATION; ZEEMAN EFFECT