Doublon-Holon binding in a half-filled band

TL;DR

This paper critically examines previous claims about spectral weight transfer in doped Mott insulators, highlighting inconsistencies and clarifying the historical development of the understanding of doublon-holon dynamics.

Contribution

It clarifies the historical and theoretical context of spectral weight transfer, challenging recent conclusions and emphasizing earlier established results.

Findings

Previous conclusions about spectral weight transfer are inconsistent or outdated.

The paper emphasizes the importance of doublon-holon binding in understanding Mott insulators.

Historical analysis shows earlier work already addressed key issues.

Abstract

The arguments presented in PRL. vol. 102, 056404 (2009) are discussed in the context of the vast literature on spectral weight transfer in doped Mott insulators. We show that the conclusions regarding spectral weight transfer in PRL. vol. 102, 056404 (2009) are, where novel, internally inconsistent and where correct, have been reached at least 18 years ago.