Comment on "Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T$_c$ superconductor"

TL;DR

This paper critiques a recent experiment claiming evidence of time-reversal symmetry breaking in a high-Tc superconductor, suggesting that overlooked temperature-dependent structural changes could invalidate the original conclusions.

Contribution

It provides a critical analysis highlighting potential overlooked factors affecting the interpretation of experimental results on symmetry breaking.

Findings

Small temperature-dependent structural changes may influence photoemission results

Overlooked superstructure variations could invalidate claims of symmetry breaking

Critical review of experimental methodology and interpretation

Abstract

We argue that that in their recent experiment in which they claim to have found evidence for a time-reversal symmetry broken state, Kaminski et al. overlooked small temperature dependent changes in the superstructure of Bi2212. These subtle changes may manifest themselves by changing the final state configurations of the photoemission process and thus invalidate their ultimate conclusions.