Volume 75, Number 5, September 2006
|Page(s)||797 - 803|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||21 July 2006|
A multi-channel fixed point for a Kondo spin coupled to a junction of Luttinger liquids
Centre for High Energy Physics, Indian Institute of Science - Bangalore 560012, India
2 Harish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211019, India
Accepted: 7 July 2006
We study a system of an impurity spin coupled to a junction of several Tomonaga-Luttinger liquids using a renormalization group scheme. For the decoupled S-matrix at the junction, there is a range of Kondo couplings which flow to a multi-channel fixed point for repulsive inter-electron interactions; this is associated with a characteristic temperature dependence of the spin-flip scatterings. If the junction is governed by the Griffiths S-matrix, the Kondo couplings flow to a strong-coupling fixed point where all the wires are decoupled.
PACS: 73.63.Nm – Quantum wires / 72.15.Qm – Scattering mechanisms and Kondo effect / 73.23.-b – Electronic transport in mesoscopic systems
© EDP Sciences, 2006
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