Current spinon-holon description of the one-dimensional charge-transfer insulator SrCuO2: Angle-resolved photoemission measurements

TL;DR

This study uses angle-resolved photoemission to explore the low-energy electronic structure of SrCuO2, revealing detailed spinon-holon behavior and accurately measuring the electronic hopping parameter in a one-dimensional charge-transfer insulator.

Contribution

It provides a detailed experimental analysis of the spinon-holon continuum and directly measures the electronic hopping parameter in SrCuO2, advancing understanding of one-dimensional strongly correlated systems.

Findings

Observation of a dispersive peak at the zone boundary.

Full monitoring of the holon branch.

Precise measurement of the electronic hopping parameter.

Abstract

We have investigated the low-energy electronic structure of the strongly correlated one-dimensional copper oxide chain compound SrCuO2 by angle resolved photoemission as a function of excitation energy. In addition to the prominent spinon-holon continuum we observe a peaklike and dispersive feature at the zone boundary. By fine-tuning the experimental parameters we are able to monitor the full holon branch and to directly measure the electronic hopping parameter with unprecedented accuracy.