Singlet-triplet transition in a quantum dot: Effect on mesoscopic transport

The T = 0 transport properties of a wire interacting with a lateral two-level quantum dot are studied by using an exact numerical calculation. The wire conductance, the spin-spin correlation and the Kondo temperature are obtained as a function of the dot level energy spacing. When the dot has two el...

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Detalles Bibliográficos
Autores principales: Davidovich, M.A., Anda, E.V., Büsser, C.A., Chiappe, G.
Formato: JOUR
Materias:
Kondo effect
Quantuam dot
Algorithms
Correlation methods
Electric conductance
Electric wire
Electron transport properties
Electrons
Hamiltonians
Quenching
Semiconductor quantum dots
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09214526_v320_n1-4_p366_Davidovich
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The T = 0 transport properties of a wire interacting with a lateral two-level quantum dot are studied by using an exact numerical calculation. The wire conductance, the spin-spin correlation and the Kondo temperature are obtained as a function of the dot level energy spacing. When the dot has two electrons and spin SD ∼ 1, the wire current is totally quenched by the S = 1 Kondo effect. The Kondo temperature is maximum at the singlet-triplet transition and its dependence upon the dot energy spacing follows a non-universal scaling law. © 2002 Elsevier Science B.V. All rights reserved.

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