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New fixed point for Kondo spin coupled to a junction of Luttinger liquids

Chandra, Ravi V and Rao, Sumathi and Sen, Diptiman (2005) New fixed point for Kondo spin coupled to a junction of Luttinger liquids. [Preprint]

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Abstract

We study a system of an impurity spin coupled to a junction of several Tomonaga-Luttinger liquids using a renormalization group scheme. By starting close to the decoupled S-matrix at the junction, we find a new stable fixed point at a finite ferromagnetic value of the Kondo coupling, for repulsive inter-electron interactions; this leads to the possibility of spin-flip scatterings even at the lowest temperatures. If the junction is governed by the Gri_ths S-matrix, we find that the Kondo coupling flows to the strong coupling fixed point (Furusaki-Nagaosa point) where all the wires are decoupled and the conductance vanishes at zero temperature.

Item Type: Preprint
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 18 Jan 2006
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ernet.in/id/eprint/4946

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