Phys. Rev. Lett. 101, 267004 (2008) [4 pages]Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate SuperconductorsReceived 4 April 2007; revised 19 March 2008; published 30 December 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.267004
DOI:
10.1103/PhysRevLett.101.267004
PACS:
74.72.Hs, 68.37.Ef, 74.25.−q, 74.50.+r
See AlsoComment: Flora Onufrieva and Pierre Pfeuty, Comment on “Preeminent Role of the Van Hove Singularity in the Strong-Coupling Analysis of Scanning Tunneling Spectroscopy for Two-Dimensional Cuprate Superconductors”, Phys. Rev. Lett. 105, 099701 (2010). |
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