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Gated-controlled electron pumping in connected quantum rings
Authors:R.P.A. Lima,F. Domí  nguez-Adame
Affiliation:1. GISC and GFTC, Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil;2. GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain
Abstract:We study the electronic transport across connected quantum rings attached to leads and subjected to time-harmonic side-gate voltages. Using the Floquet formalism, we calculate the net pumped current generated and controlled by the side-gate voltage. The control of the current is achieved by varying the phase shift between the two side-gate voltages as well as the Fermi energy. In particular, the maximum current is reached when the side-gate voltages are in quadrature. This new design based on connected quantum rings controlled without magnetic fields can be easily integrated in standard electronic devices.
Keywords:Quantum pump   Quantum ring   Time-dependent scattering
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