Busca avançada
Ano de início
Entree
(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.)

Spin versus charge noise from Kondo traps

Texto completo
Autor(es):
Dias da Silva, Luis G. G. V. [1] ; de Sousa, Rogerio [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, SP - Brazil
[2] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 2Y2 - Canada
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 92, n. 8 AUG 14 2015.
Citações Web of Science: 4
Resumo

Magnetic and charge noise have a common microscopic origin in solid-state devices, as described by a universal electron trap model. In spite of this common origin, magnetic (spin) and charge noise spectral densities display remarkably different behaviors when many-particle correlations are taken into account, leading to the emergence of the Kondo effect. We derive exact frequency sum rules for trap noise and perform numerical renormalization-group calculations to show that while spin noise is a universal function of the Kondo temperature, charge noise remains well described by single-particle theory even when the trap is deep in the Kondo regime. We obtain simple analytical expressions for charge and spin noise that account for Kondo screening in all frequency and temperature regimes, enabling the study of the impact of disorder and the emergence of magnetic 1/f noise from Kondo traps. We conclude that the difference between charge and spin noise survives even in the presence of disorder, showing that noise can be more manageable in devices that are sensitive to magnetic (rather than charge) fluctuations and that the signature of the Kondo effect can be observed in spin noise spectroscopy experiments. (AU)

Processo FAPESP: 13/50220-7 - Magnetic noise due to Kondo impurities in spintronic devices
Beneficiário:Luis Gregório Godoy de Vasconcellos Dias da Silva
Linha de fomento: Auxílio à Pesquisa - Regular