Kondo spin splitting in quantum dots with ferromagnetic leads

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The splitting of the Kondo Resonance (KR) in a quantum dot (QD) connected to ferromagnetic leads is studied using a new Slave Boson formulation. We show that the KR is splitted into two resonances out of the Fermi level. The splitting can be controlled by the application of a magnetic field in the Q...

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Detalles Bibliográficos
Autores principales: Aguiar Hualde, J.M., Chiappe, G., Anda, E.V.
Formato: JOUR
Materias:
Ferromagnetic leads
International conferences
Kondo resonances
Magnetic leads
Quantum Dot
Quantum dots
Spin transports
Spin-splitting
Electric conductivity
Electric currents
Fermi level
Fermions
Ferromagnetic materials
Ferromagnetism
Krypton
Magnetic field measurement
Magnetic fields
Magnetic materials
Optical waveguides
Quantum electronics
Resonance
Semiconductor materials
Spin dynamics
Semiconductor quantum dots
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_18626351_v3_n11_p3778_AguiarHualde
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The splitting of the Kondo Resonance (KR) in a quantum dot (QD) connected to ferromagnetic leads is studied using a new Slave Boson formulation. We show that the KR is splitted into two resonances out of the Fermi level. The splitting can be controlled by the application of a magnetic field in the QD. While this magnetic field does not modify the magnetism of the leads, it can restore the KR at the Fermi level. When the magnetization is strong enough, it's not possible to recover the KR. In addition, selective spin transport across the QD can be achieved by tuning the magnetic field. This effect is a consequence of the asymmetric Kondo splitting produced by the magnetic leads. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.

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