Volume 69, Number 3, February 2005
|Page(s)||424 - 430|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||07 January 2005|
Mesoscopic Kondo effect of a quantum dot embedded in an Aharonov-Bohm ring with intradot spin-flip scattering
Department of Physics and Engineering Physics, Stevens Institute of Technology Hoboken, NJ 07030, USA
2 Department of Physics, Shanghai Jiaotong University 1954 Huashan Road, Shanghai 200030, PRC
3 School of Optoelectronics, Information Science and Technology, Yantai University Yantai, Shandong, PRC
Accepted: 24 November 2004
We study the Kondo effect in a quantum dot embedded in a mesoscopic ring taking into account the intradot spin-flip scattering R. Based on the finite-U slave-boson mean-field approach, we find that the Kondo peak in the density of states is split into two peaks by this coherent spin-flip transition, which is responsible for some interesting features of the Kondo-assisted persistent current circulating the ring: 1) strong suppression and crossover to a sine function form with increasing R; 2) appearance of a “hump” in the R-dependent behavior for odd parity. R-induced reverse of the persistent current direction is also observed for odd parity.
PACS: 72.15.Qm – Scattering mechanisms and Kondo effect / 73.23.Ra – Persistent currents / 73.23.Hk – Coulomb blockade; single-electron tunneling
© EDP Sciences, 2005
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