Preeminent role of the Van Hove singularity in the strong-coupling analysis of scanning tunneling spectroscopy for two-dimensional cuprates

Abstract

In two dimensions the non-interacting 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-$T_c$ superconductors must be reconsidered. Based on a microscopic model which reproduces the experimental data with great accuracy, we elucidate the peculiar role played by the VHS in shaping the tunneling spectra, and show that more conventional analyses of strong-coupling effects can lead to severe errors.

5 pages, 4 figures

References in corpus (4)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d
• Role of Inelastic Tunneling through the Barrier in Scanning Tunneling Microscope Experiments on Cuprates
• Direct evidence for predominantly phonon-mediated pairing in high-temperature superconductors

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• Intermediate Coupling Model of the Cuprates
• First direct observation of the Van Hove singularity in the tunneling spectra of cuprates
• Doping dependent optical properties of Bi2201
• Disparity of superconducting and pseudogap scales in low-Tc Bi-2201 cuprates
• Density of States Modulations from Oxygen Phonons in d-wave Superconductors: Reconciling Angle-Resolved Photoemission Spectroscopy and Scanning Tunneling Microscopy
• Tunneling spectra of strongly coupled superconductors: Role of dimensionality
• Real-time edge dynamics of non-Hermitian lattices
• Dressing due to correlations strongly reduces the effect of electron-phonon coupling