Predictions for Neutron Scattering and Photoemission Experiments on CuGeO_3

TL;DR

This paper uses numerical methods to analyze a model of CuGeO_3, predicting dynamical properties that can be compared with neutron scattering and photoemission experiments, revealing unique features of one-dimensional systems.

Contribution

It provides detailed predictions of dynamical structure factors and spectral functions for CuGeO_3, including the presence of shadow bands, based on a specific theoretical model.

Findings

Predicted shadow bands in ARPES experiments for CuGeO_3.

Identified small spectral weight near the Fermi energy.

Calculated dynamical structure factors consistent with experimental data.

Abstract

Applying numerical techniques to a model recently proposed for the one dimensional spin-Peierls compound CuGeO_3, we calculate dynamical properties that can be directly compared with inelastic neutron scattering data and angle-resolved photoemission experiments. The momentum and energy dependence of the dynamical structure factor S(q,omega) are discussed, as well as the static structure factor S(q). The spectral function A(q,omega) calculated from the one particle Green's function at half-filling is shown at several values of the hole hopping amplitude t. The results have some unique features characteristic of one dimensional systems including small weight near the Fermi energy. The presence of ``shadow bands'' induced by short distance antiferromagnetic correlations is predicted to appear in ARPES experiments for CuGeO_3 and also for Sr_2CuO_3.