Magnetic phases in the one-dimensional Kondo chain on a metallic surface
Lobos, A.M. Cazalilla, M.A. Chudzinski, P.
Lobos, A.M.
Chudzinski, P.
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Abstract
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 2. © 2012 American Physical Society.
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Physical Review B - Condensed Matter and Materials Physics
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Date
2012-07-30
DOI
10.1103/PhysRevB.86.035455
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Article