Deconstruction of Resolution Effects in Angle-Resolved Photoemission

TL;DR

This paper introduces an iterative simulation method to correct for resolution effects in ARPES measurements, enabling more accurate extraction of electronic band parameters even with limited resolution.

Contribution

We develop a novel iterative simulation scheme that compensates for ARPES resolution effects, improving the accuracy of fundamental parameter extraction.

Findings

Method works for energy resolution up to 100 meV

Effective in hard and soft x-ray ARPES regimes

Enables study of bulk electronic excitations

Abstract

We study how the energy and momentum resolution of angle-resolved photoemission spectroscopy (ARPES) affects the linewidth, Fermi crossing, velocity, and curvature of the measured band structure. Based on the fact that the resolution smooths out the spectra, acting as a low-pass filter, we develop an iterative simulation scheme that compensates for resolution effects and allows the fundamental physical parameters to be accurately extracted. By simulating a parabolic band structure of Fermi-liquid quasiparticles, we show that this method works for an energy resolution up to 100 meV and a momentum resolution equal to twice the energy resolution scaled by the Fermi velocity. Our analysis acquires particular relevance in the hard and soft x-ray regimes, where a degraded resolution limits the accuracy of the extracted physical parameters, making it possible to study how the electronic excitations are modified when the ARPES probing depth increases beyond the surface.