Overscreened Kondo fixed point in S=1 spin liquid

Maksym Serbyn, T. Senthil, and Patrick A. Lee
Phys. Rev. B 88, 024419 – Published 19 July 2013

Abstract

We propose a possible realization of the overscreened Kondo impurity problem by a magnetic s=1/2 impurity embedded in a two-dimensional S=1 U(1) spin liquid with a Fermi surface. This problem contains an interesting interplay between non-Fermi-liquid behavior induced by a U(1) gauge field coupled to fermions and a non-Fermi-liquid fixed point in the overscreened Kondo problem. Using a large-N expansion together with an expansion in the dynamical exponent of the gauge field, we find that the coupling to the gauge field leads to weak but observable changes in the physical properties of the system at the overscreened Kondo fixed point. We discuss the extrapolation of this result to a physical case and argue that the realization of overscreened Kondo physics could lead to observations of effects due to gauge fields.

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  • Received 8 March 2013

DOI:https://doi.org/10.1103/PhysRevB.88.024419

©2013 American Physical Society

Authors & Affiliations

Maksym Serbyn, T. Senthil, and Patrick A. Lee

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

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Issue

Vol. 88, Iss. 2 — 1 July 2013

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