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Artículo

Non-Fermi-liquid behavior in nonequilibrium transport through Co-doped Au chains connected to fourfold symmetric leads

Di Napoli, Solange MarielIcon ; Roura Bas, Pablo GinesIcon ; Weichselbaum, Andreas; Aligia, Armando ÁngelIcon
Fecha de publicación: 09/2014
Editorial: American Physical Society
Revista: Physical Review B: Condensed Matter and Materials Physics
ISSN: 1098-0121
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We calculate the differential conductance as a function of temperature and bias voltage, G(T ,V ), through Au monatomic chains with a substitutional Co atom as a magnetic impurity, connected to a fourfold symmetric lead. The system was recently proposed as a possible scenario for observation of the overscreened Kondo physics. Stretching the chain, the system could be tuned through a quantum critical point (QCP) with three different regimes: overscreened, underscreened, and non-Kondo phases. We present calculations of the impurity spectral function by using the numerical renormalization group for the three different regimes characterizing the QCP. Nontrivial behavior of the spectral function is reported near the QCP. Comparison with results using the noncrossing approximation (NCA) shows that the latter is reliable in the overscreened regime, when the anisotropy is larger than the Kondo temperature. For these parameters, which correspond to realistic previous estimates, G(T,V) calculated within NCA exhibits clear signatures of the non-Fermi-liquid behavior within the overscreened regime.
Palabras clave: Kondo Physics , Non-Equilibrium Transport , Nca , Nrg
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)
Identificadores
URI: http://hdl.handle.net/11336/32854
URL: http://journals.aps.org/prb/pdf/10.1103/PhysRevB.90.125149
DOI: http://dx.doi.org/10.1103/PhysRevB.90.125149
URL: https://arxiv.org/abs/1405.1011
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Di Napoli, Solange Mariel; Weichselbaum, Andreas; Roura Bas, Pablo Gines; Aligia, Armando Ángel; Non-Fermi-liquid behavior in nonequilibrium transport through Co-doped Au chains connected to fourfold symmetric leads; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 90; 12; 9-2014; 125149
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