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Artículo

Scaling of conductance through quantum dots with magnetic field

Hamad, Ignacio JavierIcon ; Gazza, Claudio JavierIcon ; Andrade Hoyos, Jhon AlejandroIcon ; Aligia, Armando ÁngelIcon ; Cornaglia de la Cruz, Pablo SebastianIcon ; Roura Bas, Pablo GinesIcon
Fecha de publicación: 11/2015
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

Using different techniques, and Fermi-liquid relationships, we calculate the variation with the applied magnetic field (up to second order) of the zero-temperature equilibrium conductance through a quantum dot described by the impurity Anderson model. We focus on the strong-coupling limit U, where U is the Coulomb repulsion and is half the resonant-level width, and consider several values of the dot level energy E d , ranging from the Kondo regime to the intermediate-valence regime F − E d ∼ , where F is the Fermi energy. We have mainly used the density-matrix renormalization group (DMRG) and the numerical renormalization group (NRG) combined with renormalized perturbation theory (RPT). Results for the dot occupancy and magnetic susceptibility from the DMRG and NRG + RPT are compared with the corresponding Bethe ansatz results for U → ∞, showing an excellent agreement once E d is renormalized by a constant Haldane shift. For U < 3 a simple perturbative approach in U agrees very well with the other methods. The conductance decreases with the applied magnetic field for dot occupancies n d ∼ 1 and increases for n d ∼ 0.5 or n d ∼ 1.5 regardless of the value of U . We also relate the energy scale for the magnetic-field dependence of the conductance with the width of the<br />low-energy peak in the spectral density of the dot.
Palabras clave: Scaling , Quantum Dots , Kondo , Magnetic Field
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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-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/42328
DOI: http://dx.doi.org/10.1103/PhysRevB.92.195113
URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.195113
URL: https://arxiv.org/abs/1509.05948
Colecciones
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Hamad, Ignacio Javier; Gazza, Claudio Javier; Andrade Hoyos, Jhon Alejandro; Aligia, Armando Ángel; Cornaglia de la Cruz, Pablo Sebastian; et al.; Scaling of conductance through quantum dots with magnetic field; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 92; 19; 11-2015; 1-9; 195113
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