Access to the full 3D Brillouin zone with time resolution, using a new tool for pump-probe ARPES

TL;DR

This paper introduces a novel TR-ARPES setup utilizing the FeSuMa analyzer, enabling access to the full 3D Brillouin zone with temporal resolution, advancing the study of electronic structures in materials.

Contribution

The paper presents the first implementation of the FeSuMa analyzer for time-resolved ARPES, integrating it into a pump-probe setup with photon-energy-dependent scanning capabilities.

Findings

FeSuMa allows full 3D Brillouin zone access with time resolution.

Enhanced momentum-space coverage using the fisheye mode.

Successful integration into a pump-probe beamline with high harmonic generation.

Abstract

Here we report the first time- and angle-resolved photoemission spectroscopy (TR-ARPES) with the new Fermiologics "FeSuMa" analyzer. The new experimental setup has been commissioned at the Artemis laboratory of the UK Central Laser Facility. We explain here some of the advantages of the FeSuMa for TR-ARPES and discuss how its capabilities relate to those of hemispherical analyzers and momentum microscopes. We have integrated the FeSuMa into an optimized pump-probe beamline that permits photon-energy- (i.e., kz-) dependent scanning, using probe energies generated from high harmonics in a gas jet. The advantages of using the FeSuMa in this situation include the possibility of taking advantage of its "fisheye" mode of operation.