The underscreened Kondo effect in ladder systems

Abstract

We introduce a new Kondo ladder model by coupling the well-known Takhtajan-Babujan S=1 chain to a half-filled one-dimensional electron gas, and we solve it using quantum field theory techniques. Through the so-called underscreened Kondo effect, this gives novel insights into low-dimensional spin liquid systems. For instance, the optical conductivity reveals only a pseudogap at $k=\pi$ despite of the insulating state, a coherent magnon peak in the dynamical spin susceptibility coexists with an incoherent spinon background, the magnetization yields a fractional-like quantization. More generally, this problem belongs to the class of Luttinger liquids in active environments, a topic of importance not only to the Kondo physics, but also to striped phases or carbon nanotubes. Experimental consequences on heavy-fermion systems are also discussed.

5 pages, RevTeX; to be published in Physical Review Letters

Cited by in corpus (5)

• Many-Body Quantum Electrodynamics Networks: Non-Equilibrium Condensed Matter Physics with Light
• Chirally Stabilized Critical State in Marginally Coupled Spin and Doped Systems
• Singular dynamics and pseudogap formation in the underscreened Kondo impurity and Kondo lattice models
• Magnetism and superconductivity in underscreened Kondo chains
• Metal-Kondo insulating transitions and transport in one dimension