| Full text | |
| Author(s): |
Wong, Arturo
;
Lane, W. Brian
;
Dias da Silva, Luis G. G. V.
;
Ingersent, Kevin
;
Sandler, Nancy
;
Ulloa, Sergio E.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 85, n. 11, p. 6-pg., 2012-03-22. |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 10/20804-9 - Electronic correlations and real-time dynamics in nanostructures: a computational approach |
| Grantee: | Luis Gregório Godoy de Vasconcellos Dias da Silva |
| Support Opportunities: | Regular Research Grants |