Robustness of the global non-analytical fit to the analysis of peak-dip-hump lineshape in bilayer-split spectra of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$

TL;DR

This paper revisits the global non-analytical fitting method for analyzing the peak-dip-hump lineshape in bilayer-split spectra of Bi2212, confirming the robustness of the results and their physical correlation with superfluid density.

Contribution

It demonstrates the robustness of the global non-analytical fit across different schemes and confirms the physical link between the superconducting peak and superfluid density.

Findings

Fitting results are robust across various schemes.

Superconducting peak correlates with superfluid density.

Analysis confirms physical interpretation of spectral features.

Abstract

The application of global non-analytical fit to the quantitative spectral analysis of the bilayer-split peak-dip-hump lineshape of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ at $(\pi,0)$ are revisited. The robustness of the results is verified by various fitting schemes confirming physically the correlation of the superconducting peak with the superfluid density.