Coulomb Blockade Resonances in Quantum Wires

2); (2) Faculty of Mathematics; (3) DERA; A. Ramsak (1; Electronic Sector; England); Great Malvern; J. H. Jefferson (3) ((1) J. Stefan Institute; Ljubljana; Physics

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Coulomb Blockade Resonances in Quantum Wires

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arxiv cond-mat/9910399 v1 submitted 1999-10-25 cond-mat.mes-hall

T. Rejec (1) , A. Ramsak (1 , 2) , J. H. Jefferson (3) ((1) J. Stefan Institute , Ljubljana , Slovenia , (2) Faculty of Mathematics , Physics

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University of Ljubljana (3) DERA Electronic Sector Great Malvern England)

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classification cond-mat.mes-hall

keywords quantumresonancesblockadeconductancecoulombnearrelatedresonance

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The conductance through a quantum wire of cylindrical cross section and a weak bulge is solved exactly for two electrons within the Landauer-Buettiker formalism. We show that this 'open' quantum dot exhibits spin-dependent Coulomb blockade resonances resulting in two anomalous structure on the rising edge to the first conductance plateau, one near 0.25(2e^2/h), related to a singlet resonance, and one near 0.7(2e^2/h), related to a triplet resonance. These resonances are generic and robust, occurring for other types of quantum wire and surviving to temperatures of a few degrees.

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