Many-Body Approch to Spin-Dependent Transport in Quantum Dot Systems

Abstract

By means of a diagram technique for Hubbard operators we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g. quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction sub-bands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behaviour for ferromagnetically ordered leads.

arXiv comment8 pages, 5 figures

References in corpus (9)

• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• Low Temperature Transport through a Quantum Dot: The Anderson Model out of Equilibrium
• From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
• The Kondo Effect in the Unitary Limit
• Finite-element theory of transport in ferromagnet-normal metal systems
• Quantum Dot as Spin Filter and Spin Memory
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• Spin fractionalization of an even number of electrons in a Quantum dot

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• Angular Conductance Resonances of Quantum Dots Non-Collinearly Coupled to Ferromagnetic Leads
• Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
• Formation of pure two-electron triplet states in weakly coupled quantum dots attached to ferromagnetic leads
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• Coulomb-Blocked Transport Through a Quantum Dot with Spin-Split Level: Increase of Differential Conductance Peaks by Spin Relaxation
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