Publication: Quantum electron splitter based on two quantum dots attached to leads
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2006-07
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American Physical Society
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Abstract
Electronic transport properties of two quantum dots side-coupled to a quantum wire are studied by means of the two impurity Anderson Hamiltonian. The conductance is found to be a superposition of Fano and Breit-Wigner resonances as a function of the Fermi energy, when the gate voltages of the quantum dots are slightly different. Under this condition, we analyze the time evolution of a Gaussian-shaped superposition of plane waves incoming from the source lead, and found that the wave packet can be split into three packets at the drain lead. This spatial pattern manifests in a direct way the peculiarities of the conductance in energy space. We conclude that the device acts as a quantum electron splitter.
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© 2006 The American Physical Society.
Work at Madrid was supported by MEC MAT2003-01533. A.V.M. acknowledges financial support of MEC through the Ramón y Cajal program. P.A.O. would like to thank Milenio ICM P02-054-F and FONDECYT under Grants No. 1060952 and No. 7020269 for financial support. Moreover, P.A.O. would like to thank the Departamento de FÃsica de Materiales of the Universidad Complutense de Madrid for their hospitality during his visit.
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