Anomalous S-like dispersion of in-gap single-particle excitations in the pseudogap state of cuprate superconductors

Julius Ranninger (1) , Alfonso Romano

1 NEEL - TMC - Théorie de la Matière Condensée

The single-particle excitations, which initiate the pseudogap in the cuprate superconductors at some temperature T^*, relate to specific local spectral features of resonant pairing, where charge carriers get momentarily trapped on dynamically deformable molecular Cu-O-Cu clusters. We show how those local excitations evolve into dispersive branches with a characteristic "S"-like shape for three-peak structured ingap excitations in the cuprates' pseudogap phase, when we consider a lattice of such clusters. This feature should be detectable in "momentum distribution curve" ARPES analysis.

Domaines: Supraconductivité [cond-mat.supr-con]

Julius Ranninger, Alfonso Romano. Anomalous S-like dispersion of in-gap single-particle excitations in the pseudogap state of cuprate superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82 (5), pp.054508. ⟨10.1103/PhysRevB.82.054508⟩. ⟨hal-00717400⟩