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

Article Article scientifique Article Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors eng 2008 author Levy De Castro Francisco Giorgio 550868 author Berthod Christophe 0000-0002-0787-008X 133299 author Piriou Alexandre 587309 author Giannini Enrico 0000-0003-3536-4771 503364 author Fischer Oystein 25258 267004 10.1103/PhysRevLett.101.267004 0031-9007 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. Dewey 500.2 33 Département de physique de la matière quantique 131 false Physical review letters 101 26 8e9d9900-b832-4bd1-9cb5-43699266d789 Article (Published version) Public REPRINT.pdf 344847 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors	Physical review letters			2008	676	1,073

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Levy De Castro, Francisco Giorgio