Magnetic flux and strain effects on electron transport in a linear array of nanoscopic rings

Eric R. Hedin and Yong S. Joe ()
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Eric R. Hedin: Center for Computational Nanoscience, Department of Physics and Astronomy, Ball State University
Yong S. Joe: Center for Computational Nanoscience, Department of Physics and Astronomy, Ball State University

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 3, 1-8

Abstract: Abstract Electron transport through a linear array of nanoscopic rings with six quantum dot sites per ring is investigated in the presence of an external magnetic flux producing an Aharonov-Bohm phase shift effect. A tight-binding model is employed to analytically calculate the transmission as a function of electron energy, external flux, and inter-site coupling parameters. Current vs. voltage relationships of the ring system are computed using a standard scattering theory of transport and shown to modulate between semiconductor and ohmic characteristics. System parameters are adjusted in order to study the effects of a longitudinal strain on the transmission properties of the linear multiple-ring array. Longitudinal strain is modeled with a Slater-Koster type theory and is demonstrated to affect the transmission properties primarily by narrowing the transmission bands and opening up additional bandgaps in the band structure. In addition, a universal resonant transmission condition as a function of flux is extended to show that the application of strain causes the resonant transmission peaks to converge towards one-half of a flux quantum.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80025-8

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