Magnetic phases in the one-dimensional Kondo chain on a metallic surface

Details Magnetic phases in the one-dimensional Kondo chain on a metallic surface Magnetic phases in the one-dimensional Kondo chain on a metallic surface

2012-02-24

arxiv.org/abs/1202.5545v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 3 figures

Scientific paper

We study the low-temperature properties of a one-dimensional spin-1/2 chain of magnetic impurities coupled to a (normal) metal environment by means of anisotropic Kondo exchange. In the case of easy-plane anisotropy, we obtain the phase diagram of this system at T=0. We show that the in-plane Kondo coupling destabilizes the Tomonaga-Luttinger phase of the spin-chain, and leads to two different phases: i) At strong Kondo coupling, the spins in the chain form Kondo singlets and become screened by the metallic environment, and ii) At weak and intermediate Kondo coupling, we find a novel dissipative phase characterized by diffusive gapless spin excitations. The two phases are separated by a quantum critical point of the Wilson-Fisher universality class with dynamical exponent $z\simeq2$.

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