Tuning Fano-type resonances in coupled quantum point contacts by applying asymmetric voltages

Details Tuning Fano-type resonances in coupled quantum point contacts by applying asymmetric voltages Tuning Fano-type resonances in coupled quantum point contacts by applying asymmetric voltages

2011-05-03

arxiv.org/abs/1105.0687v1

Applied Physics Letters 98, 172102, 2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

published in APL

Scientific paper

10.1063/1.3579538

We study the ballistic magnetotransport in a double quantum point contact (QPC) device consisting of a quasi-one-dimensional quantum wire with an embedded island-like impurity - etched nano-hole as in a recently published experiment [J. C. Chen, Y. Lin, K.-T. Lin, T. Ueda and S. Komiyama, Appl. Phys. Lett. 94, 012105 (2009)]. We reproduce the zero field quantized conductance, the interference phenomenon induced by the coupled QPCs, as well as the Ramsauer-like resonances observed in the experiments. At finite magnetic fields Fano-type resonances arises in the conductance due to the formation of localized states at the impurity periphery and to an inter-edge state resonant coupling effect. It is predicted that the Fano-type resonances can be controlled by an asymmetric confinement of the QPCs.

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