Quantum dot spin effect on the conductance of a quantum wire

Maria A. Davidovich, E. V. Anda, C. A. Büsser, and G. Chiappe
Phys. Rev. B 65, 233310 – Published 31 May 2002
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Abstract

A numerically exact calculation of the T=0 transport properties of a quantum wire interacting with a lateral two-level quantum dot is presented. The wire conductance is calculated for all different states of charge and spin of the quantum dot. For a dot with two electrons we obtain an enhancement of the Kondo temperature at the singlet-triplet transition and a nonuniversal scaling law for its dependence upon the dot energy spacing. We find that the Kondo correlation is stronger for a dot spin SD1 than for SD1/2. In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and 1/2SD1 the wire conductance is partially quenched except in a very small region of gate potential where it reaches the maximum value e2/h.

  • Received 1 February 2002

DOI:https://doi.org/10.1103/PhysRevB.65.233310

©2002 American Physical Society

Authors & Affiliations

Maria A. Davidovich1, E. V. Anda1, C. A. Büsser2, and G. Chiappe2

  • 1Departamento de Física, Pontificia Universidade Católica do Rio de Janeiro, Caixa Postal 38071-970, Rio de Janeiro, RJ, Brazil
  • 2Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Ciudad Universitaria, 1428, Buenos Aires, Argentina

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Issue

Vol. 65, Iss. 23 — 15 June 2002

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