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

Campuzano, J. C.; Kaminski, A.; Varma, C. M.

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

Authors

Campuzano, J. C.

Kaminski, A.

Varma, C. M.

Description

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.
some typos corrected