Simultaneous Transitions in Cuprate Momentum-Space Topology and Electronic Symmetry Breaking

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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 (JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0281/v/2017-09-12T051156Z/r/image-png-space) electronic structure underpinning the superconductivity has not yet been established. Here, we visualize the JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0423/v/2017-09-12T051156Z/r/image-png = 0 (intra—unit-cell) and JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0423/v/2017-09-12T051156Z/r/image-png ≠ 0 (density-wave) broken-symmetry states, simultaneously with the coherent JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0281/v/2017-09-12T051156Z/r/image-png-space topology, for Bi2Sr2CaCu2O8+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 pc = 0.19. Concomitantly, the coherent JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0281/v/2017-09-12T051156Z/r/image-png-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc. These data reveal that the JOURNAL/scie/04.02/00007529-201405090-00036/ENTITY_OV0281/v/2017-09-12T051156Z/r/image-png-space topology transformation in cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.

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