Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator
Abstract
The Kondo lattice is one of the classic examples of strongly correlated electronic systems. We conduct a controlled study of the Kondo lattice in one dimension, highlighting the role of excitations created by the composite fermion operator. Using time-dependent matrix-product-state methods we compute various correlation functions and contrast them with both large-N mean-field theory and the strong-coupling expansion. We show that the composite fermion operator creates long-lived, charge-e and spin-1/2 excitations, which cover the low-lying single-particle excitation spectrum of the system. Furthermore, spin excitations can be thought to be composed of such fractionalized quasi-particles with a residual interaction which tend to disappear at weak Kondo coupling.
Keywords
Cite
@article{arxiv.2302.09701,
title = {Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator},
author = {Jing Chen and E. Miles Stoudenmire and Yashar Komijani and Piers Coleman},
journal= {arXiv preprint arXiv:2302.09701},
year = {2024}
}