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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Signatures of quantum phase transitions in parallel quantum dots: Crossover from local moment to underscreened spin-1 Kondo physics

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Autor(es):
Wong, Arturo [1, 2] ; Lane, W. Brian [1, 3] ; Dias da Silva, Luis G. G. V. [4] ; Ingersent, Kevin [1] ; Sandler, Nancy [2] ; Ulloa, Sergio E. [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Florida, Dept Phys, Gainesville, FL 32611 - USA
[2] Ohio Univ, Dept Phys & Astron, Nanoscale & Quantum Phenomena Inst, Athens, OH 45701 - USA
[3] Jacksonville Univ, Dept Phys, Jacksonville, FL 32211 - USA
[4] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 85, n. 11 MAR 22 2012.
Citações Web of Science: 13
Resumo

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)

Processo FAPESP: 10/20804-9 - Estudos computacionais de correlação eletrônica e dinâmica dependente do tempo em nanoestruturas
Beneficiário:Luis Gregório Godoy de Vasconcellos Dias da Silva
Linha de fomento: Auxílio à Pesquisa - Regular