Angle Resolved Photemission Experiments to look for Time-reversal Violation in Cuprates

TL;DR

This paper critically examines recent ARPES experiments on cuprates, highlighting issues with evidence for pseudogap magnitude and temperature dependence of dichroic signals, questioning claims of time-reversal violation detection.

Contribution

It provides a critical analysis of experimental conditions and data interpretation in the search for time-reversal violation in cuprates using ARPES.

Findings

No clear evidence for pseudogap magnitude or onset temperature.

Observed dichroic signal differences contradict original conclusions.

Highlights issues in experimental data interpretation.

Abstract

The recent experiments reported by Borisenko et al. (cond-mat/0305179 v2), are examined in light of the conditions to be satisfied in the search for time-reversal violation by circularly polarized ARPES. Two principal problems are found: (1) A lack of any evidence for the magnitude of the pseudogap or the temperature of its onset in the samples studied. (2) A difference in the dichroic signal at low and high temperatures. The difference is greater than the stated error bars and is contrary to the conclusions reached in the paper.