title: Superconductors: time-reversal symmetry breaking?
abstract: One of the mysteries of modern condensed-matter physics is the nature of the pseudogap state of the superconducting cuprates. Kaminski et al. claim to have observed signatures of time-reversal symmetry breaking in the pseudogap regime in underdoped Bi2Sr2CaCu2O8+delta (Bi2212). Here we argue that the observed circular dichroism is due to the 51 superstructure replica of the electronic bands and therefore cannot be considered as evidence for spontaneous time-reversal symmetry breaking in cuprates.
authors.affiliation: Institute for Solid State Research, IFW-Dresden, PO Box 270016, 01171, Dresden, Germany. s.borisenko@ifw-dresden.de
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Borisenko
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Kordyuk
authors.forename: Andreas
authors.initials: A
authors.lastname: Koitzsch
authors.forename: Martin
authors.initials: M
authors.lastname: Knupfer
authors.forename: Jörg
authors.initials: J
authors.lastname: Fink
authors.forename: Helmuth
authors.initials: H
authors.lastname: Berger
authors.forename: Chengtian T
authors.initials: CT
authors.lastname: Lin