Spectroscopic Imaging STM: Atomic-Scale Visualization of Electronic Structure and Symmetry in Underdoped Cuprates
Chapter in Strongly Correlated Systems, Springer Nature 180 (2015) 73-109
Direct evidence for a magnetic f-electron–mediated pairing mechanism of heavy-fermion superconductivity in CeCoIn5
Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 111:32 (2014) 11663-11667
Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences 111:30 (2014) e3026-e3032
Simultaneous transitions in cuprate momentum-space topology and electronic symmetry breaking
Science 344:6184 (2014) 612-616
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 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 k →-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc. 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.Enigmatic nematic
Nature Physics Springer Nature 10:3 (2014) 184-185