Underscreened Kondo impurities in a Luttinger liquid

TL;DR

This paper investigates the thermodynamic and transport properties of underscreened Kondo impurities in a Luttinger liquid, revealing Fermi liquid-like thermodynamics but non-Fermi liquid transport behavior, with potential quantum dot realizations.

Contribution

It provides a detailed analysis of underscreened Kondo physics in Luttinger liquids, highlighting the contrasting thermodynamic and transport behaviors and discussing experimental realizations.

Findings

Thermodynamic quantities show Fermi liquid-like temperature dependence.

Transport properties exhibit non-Fermi liquid Luttinger liquid behavior.

Anomalous power law exponents appear in subleading thermodynamic terms.

Abstract

We study the problem of underscreened Kondo physics in an interacting electronic system modeled by a Luttiger Liquid (LL). We find that the leading temperature dependence of thermodynamical quantities like the specific heat, spin susceptibility are Fermi Liquid like in nature. However, anomalous power law exponents are seen in the subleading terms. We also discuss possible realizations through single and double quantum dot configurations coupled to LL leads and its consequences for electronic transport. The leading low temperature transport behavior is seen to exhibit in general, non Fermi liquid LL behavior unlike the thermodynamical quantities.