Spin-incoherent behavior in the ground state of strongly correlated systems

TL;DR

This paper demonstrates that the ground state of certain strongly correlated one-dimensional systems exhibits spin-incoherent behavior, traditionally associated with finite-temperature effects, expanding understanding of such phenomena.

Contribution

The study provides numerical evidence of spin-incoherent physics in the ground state of a t-J-Kondo lattice, suggesting broader applicability in strongly interacting systems.

Findings

Ground state shows signatures of spin-incoherent behavior

Numerical evidence supports spin-incoherent physics at zero temperature

Potential presence of similar physics in other strongly correlated systems

Abstract

It is commonly believed that strongly interacting one-dimensional Fermi systems with gapless excitations are effectively described by Luttinger liquid theory. However, when the temperature of the system is high compared to the spin energy, but small compared to the charge energy, the system becomes "spin-incoherent". We present numerical evidence showing that the one-dimensional "t-J-Kondo" lattice, consisting of a t-J chain interacting with localized spins, displays all the characteristic signatures of spin-incoherent physics, but in the {\it ground state}. We argue that similar physics may be present in a wide range of strongly interacting systems.