Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors
G. LevyDPMC-MaNEP, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, SwitzerlandChristophe BerthodDPMC-MaNEP, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, SwitzerlandA. PiriouDPMC-MaNEP, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, SwitzerlandEnrico GianniniDPMC-MaNEP, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, SwitzerlandØ. FischerDPMC-MaNEP, Université de Genève, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland
2008en
ABI
Аннотация
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.
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