2012/02/29 by Alejandro M. Lobos, Miguel A. Cazalilla, Piotr Chudziński +1 · 25 citations
Physics and Astronomy · #Anisotropy #Condensed matter physics #Exponent #Impurity #Kondo effect #Kondo insulator #Kondo model #Magnetic impurity #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum critical point #Quantum many-body systems #Quantum mechanics #Quantum phase transition #Renormalization group #Spin (aerodynamics) #Spins #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.86.035455
published in Physical Review B 86(3) (American Physical Society) · 15 pages, 3 figures. New version contains clarifications about the specific approximations. Accepted for publication in PRB
arxiv created 2012/07/25 · openalex publication_date 2012/07/30 · arxiv updated 2012/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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\ensuremath≃2.