Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-16
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures. Accepted for publication in Phys. Rev. B
Scientific paper
We study a strongly interacting "quantum dot 1" and a weakly interacting "dot 2" connected in parallel to metallic leads. Gate voltages can drive the system between Kondo-quenched and non-Kondo free-moment phases separated by Kosterlitz-Thouless quantum phase transitions. Away from the immediate vicinity of the quantum phase transitions, the physical properties retain signatures of first-order transitions found previously to arise when dot 2 is strictly noninteracting. As interactions in dot 2 become stronger relative to the dot-lead coupling, the free moment in the non-Kondo phase evolves smoothly from an isolated spin-one-half in dot 1 to a many-body doublet arising from the incomplete Kondo compensation by the leads of a combined dot spin-one. These limits, which feature very different spin correlations between dot and lead electrons, can be distinguished by weak-bias conductance measurements performed at finite temperatures.
da Silva Luis G. G. V. Dias
Ingersent Kevin
Lane Brian W.
Sandler Nancy
Ulloa Sergio E.
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