Temperature dependence of spinon and holon excitations in one-dimensional Mott insulators

TL;DR

This study investigates how temperature affects spinon and holon excitations in one-dimensional Mott insulators using advanced numerical methods, aligning with recent ARPES experimental observations.

Contribution

It provides a detailed numerical analysis of temperature-dependent spinon and holon excitations in the 1D Hubbard model, connecting theory with recent experimental data.

Findings

Spinon and holon branches become observable at temperatures with developed antiferromagnetic correlations.

The spinon branch grows rapidly at these temperatures.

Numerical results agree with ARPES measurements on SrCuO${}_{2}$ and Na${}_{0.96}$V${}_{2}$O${}_{5}$.

Abstract

Motivated by the recent angle-resolved photoemission spectroscopy (ARPES) measurements on one-dimensional Mott insulators, SrCuO${}_{2}$ and Na${}_{0.96}$V${}_{2}$O${}_{5}$, we examine the single-particle spectral weight of the one-dimensional (1D) Hubbard model at half-filling. We are particularly interested in the temperature dependence of the spinon and holon excitations. For this reason, we have performed the dynamical density matrix renormalization group and determinantal quantum Monte Carlo (QMC) calculations for the single-particle spectral weight of the 1D Hubbard model. In the QMC data, the spinon and holon branches become observable at temperatures where the short-range antiferromagnetic correlations develop. At these temperatures, the spinon branch grows rapidly. In the light of the numerical results, we discuss the spinon and holon branches observed by the ARPES experiments on SrCuO${}_{2}$. These numerical results are also in agreement with the temperature dependence of the ARPES results on Na${}_{0.96}$V${}_{2}$O${}_{5}$.