Hemispherical Momentum Microscope

• Subject Area: Condensed Matter Physics
• Term: Funded in 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 545799924

Time-resolved momentum microscopy using the "first generation" of these machines has led to a number of spectacular scientific results in solid-state physics in recent years. New experimental approaches based on momentum microscopy are currently being designed, developed and advanced, as impressively demonstrated, for example, by the current combination of momentum and dark-field microscopy. On the other hand, these pioneering experiments have revealed the need for technical improvements that are not yet commercially available, but which would significantly enhance the experimental possibilities even further in the future. Examples include methods for space-charge-suppression, modes with higher energy resolution, bandpass filtering of energy ranges, suppression of low-energy pump electrons, a modular aperture exchange for dark-field momentum microscopy, and an extension of the number of built-in apertures in real- and momentum-space. A new type of hemispherical momentum microscope fulfilling all these additional requirements will be set-up in combination with a pulsed soft X-ray source. This unique "second generation" of time-resolved momentum microscopy will be used to address scientific questions in the fields of two-dimensional quantum materials, strongly correlated materials, and hybrid organic-inorganic materials.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Halbkugel-Impulsmikroskop
• Instrumentation Group: 1780 Photoelektronenspektrometer (UPS und XPS)
• Applicant Institution: Georg-August-Universität Göttingen
• Leader: Professor Dr. Stefan Mathias