Application of the pseudo-Voigt function to the analysis of single-particle tunneling spectra of [formula omitted]-wave superconductors

Abstract

In this study, we focused on the peak–dip–hump structure, which is a hallmark of cuprate superconductivity and is often used to explore the relationship between strong electron–phonon coupling and superconductivity. Specifically, we examined the peak–dip–hump structure and other features of cuprate tunneling spectra in d-wave superconductor–insulator–normal metal (dSC–I–N) junctions. To demonstrate the peak–dip–hump structure and other features of cuprate tunneling spectra, we applied the pseudo-Voigt function as an energy-dependent gap. We also analyzed two important experimental features of the tunneling spectra, namely the temperature and doping evolution of the differential conductance. Finally, we compared our calculation results with experimental data and found a good quantitative agreement between theory and experimental data in the considered cases.