Elastic Scattering Susceptibility of the High Temperature Superconductor Bi2Sr2CaCu2O8+x: A Comparison between Real and Momentum Space Photoemission Spectroscopies

TL;DR

This study compares the joint density of states derived from ARPES and STM techniques in a high-temperature superconductor, revealing good agreement and providing new insights into tunneling data.

Contribution

It introduces a method to compare ARPES and STM data through autocorrelation of spectral functions, enhancing understanding of tunneling matrix elements in superconductors.

Findings

Good agreement between ARPES and STM measurements for different doping levels.

Comparison reveals insights into STM matrix elements and tunneling mechanisms.

New understanding of the relationship between real and momentum space spectroscopies.

Abstract

The joint density of states (JDOS) of Bi2Sr2CaCu2O8+x is calculated by evaluating the autocorrelation of the single particle spectral function A(k,omega) measured from angle resolved photoemission spectroscopy (ARPES). These results are compared with Fourier transformed (FT) conductance modulations measured by scanning tunneling microscopy (STM). Good agreement between the two experimental probes is found for two different doping values examined. In addition, by comparing the FT-STM results to the autocorrelated ARPES spectra with different photon polarization, new insight on the form of the STM matrix elements is obtained. This shines new light on unsolved mysteries in the tunneling data.