Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors

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Title		Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors
Authors		Levy De Castro, Francisco Giorgio Berthod, Christophe Piriou, Alexandre Giannini, Enrico Fischer, Oystein
Published in		Physical Review Letters. 2008, vol. 101, no. 26, p. 267004
Abstract		In two dimensions the noninteracting density of states displays a van Hove singularity (VHS) which introduces an intrinsic electron-hole asymmetry, absent in three dimensions. We show that due to this VHS the strong-coupling analysis of tunneling spectra in high-Tc superconductors must be reconsidered. Based on a microscopic model which reproduces the experimental data with excellent accuracy, we elucidate the peculiar role played by the VHS in shaping the tunneling spectra, and show that more conventional analysis of strong-coupling effects can lead to severe errors.
Identifiers		DOI: 10.1103/PhysRevLett.101.267004
Full text		Article (Published version) (337 Kb) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation (ISO format)		LEVY DE CASTRO, Francisco Giorgio et al. Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors. In: Physical Review Letters, 2008, vol. 101, n° 26, p. 267004. doi: 10.1103/PhysRevLett.101.267004 https://archive-ouverte.unige.ch/unige:23840