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Effect of the Charge and Spin of a Lateral Quantum Dot on a Wire Current
Author(s) -
Davidovich M.A.,
Büsser C.A.,
Anda E.V.,
Chiappe G.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200207)232:1<66::aid-pssb66>3.0.co;2-p
Subject(s) - quantum dot , condensed matter physics , quantum wire , physics , kondo effect , conductance , spin (aerodynamics) , charge (physics) , valence (chemistry) , quantum , electrical resistivity and conductivity , quantum mechanics , thermodynamics
The transport properties of a quantum wire interacting with a lateral two‐level quantum dot are presented. A cluster including the dot and its vicinity is diagonalized and embedded into the rest of the system. The result is numerically exact for T = 0. The wire conductance is calculated for all different states of charge and spin of the quantum dot. 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 the gate potential where it reaches the maximum value e 2 / h .