Effect of a Variable-Spin Quantum Dot on a Wire Conductance

2001/06/27 by Maria A. Davidovich, E. V. Anda, Davidovich, Maria A. +5
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0106564

4 pages, 3 figures

arxiv created 2001/06/27 · arxiv updated 2009/11/30

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 non-universal scaling law for its dependence upon the dot energy spacing. We find that the Kondo correlation is stronger for a dot spin S_D ∼ 1 than for S_D ∼ 1/2. In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and 1/2 < S_D < 1 the wire conductance is partially quenched except in a very small region of gate potential where it reaches the maximum value e²/h.

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