Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

O 68.8: Topical Talk

Donnerstag, 8. September 2022, 17:30–18:00, H3

Is there a perfect electron analyzer for time-resolved ARPES? — •Laurenz Rettig — Fritz-Haber-Institut der Max-Planck-Gesellschaft

Recent years have seen a huge popularity of time-of-flight based momentum microscopes (MMs), which based on advanced electrostatic optics have revolutionized angle-resolved photoemission spectroscopy (ARPES). Compared to conventional hemispherical analyzers (HAs) with angle-dispersing electron lenses, which access only a small fraction of the reciprocal space at a given configuration, MMs allow for the simultaneous detection of multiple Brillouin zones without the need to rearrange the sample geometry. However, one drawback of such instruments, in particular in time-resolved studies, arises from the large energy and momentum range covered simultaneously, which in combination with detection limitations of delay-line detectors and space charge restrictions can severely reduce the effective detection rate for selected energy-momentum regions compared to conventional HAs.

In my talk I will discuss the advantages and limitations of both types of instruments for several application scenarios in time-resolved ARPES, and present some recent highlights in charge-density wave materials, which take advantage of the combination of both types of instruments.