Kondo effect in quantum dots coupled with noncollinear ferromagnetic leads

D. Matsubayashi, M. Eto

研究成果: Conference contribution

抄録

We study the Kondo effect in a quantum dot coupled to two noncollinear ferromagnetic leads. First, we study the spin splitting δε = ε↑ - ε↓ in the quantum dot by the tunnel coupling to the ferromagnetic leads, using the Poor man's scaling method. The spin splitting takes place in an intermediate direction between the polarization directions in the two leads. δε ∞ cos(θ/2), where θ is the angle between the polarization directions; spin splitting is maximal in the parallel alignment of two ferromagnets (θ = 0) and disappears in the antiparallel alignment (θ = π). Second, we calculate the Kondo temperature T K. The scaling calculation yields an analytical expression of T K as a function of θ and polarization ratio p in the ferromagnets, TK (θ,p), when δe << TK. When δe is relevant, we evaluate TK(δε, θ, p) using the slave-boson mean field method. The Kondo resonance is split into two by finite δε, which results in the suppression of Kondo effect.

本文言語English
ホスト出版物のタイトルMS+S 2006 - Controllable Quantum States
ホスト出版物のサブタイトルMesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium
出版社World Scientific Publishing Co. Pte Ltd
ページ227-232
ページ数6
ISBN(印刷版)9812814612, 9789812814616
出版ステータスPublished - 2008 1 1
イベント4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006 - Atsugi, Japan
継続期間: 2006 2 272006 3 2

出版物シリーズ

名前MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium

Other

Other4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006
国/地域Japan
CityAtsugi
Period06/2/2706/3/2

ASJC Scopus subject areas

  • 電子工学および電気工学

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