title: Simultaneous transitions in cuprate momentum-space topology and electronic symmetry breaking.
abstract: The existence of electronic symmetry breaking in the underdoped cuprates and its disappearance with increased hole density p are now widely reported. However, the relation between this transition and the momentum-space (k-space) electronic structure underpinning the superconductivity has not yet been established. Here, we visualize the Q = 0 (intra-unit-cell) and Q ≠ 0 (density-wave) broken-symmetry states, simultaneously with the coherent k-space topology, for Bi₂Sr₂CaCu₂O(8+δ) samples spanning the phase diagram 0.06 ≤ p ≤ 0.23. We show that the electronic symmetry-breaking tendencies weaken with increasing p and disappear close to a critical doping p(c) = 0.19. Concomitantly, the coherent k-space topology undergoes an abrupt transition, from arcs to closed contours, at the same p(c). These data reveal that the k-space topology transformation in cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
authors.forename: K
authors.initials: K
authors.lastname: Fujita
authors.forename: Chung Koo
authors.initials: CK
authors.lastname: Kim
authors.forename: Inhee
authors.initials: I
authors.lastname: Lee
authors.forename: Jinho
authors.initials: J
authors.lastname: Lee
authors.forename: M H
authors.initials: MH
authors.lastname: Hamidian
authors.forename: I A
authors.initials: IA
authors.lastname: Firmo
authors.forename: S
authors.initials: S
authors.lastname: Mukhopadhyay
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.forename: S
authors.initials: S
authors.lastname: Uchida
authors.forename: M J
authors.initials: MJ
authors.lastname: Lawler
authors.forename: E-A
authors.initials: EA
authors.lastname: Kim
authors.forename: J C
authors.initials: JC
authors.lastname: Davis