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

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

2002-06-05

arxiv.org/abs/cond-mat/0206048v1

Physical Review Letters 88, 226601 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.226601

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.

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