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O: Fachverband Oberflächenphysik

O 67: Focus Session: Unoccupied States by Inverse Photoemission II

Mittwoch, 11. März 2026, 15:00–18:00, WILL/A317

The Other Half of the Picture: 50 Years of Direct Access to Unoccupied States by Inverse Photoemission

In 1981, J. Pendry evaluated the experimental access to electron states in solids: "Currently only half of the picture can be seen with photoemission. Inverse photoemission provides the other half." A complete picture of electron states needs both occupied and unoccupied states in order to describe, understand, and finally tailor macroscopic material properties. In 1976, V. Dose had submitted a first paper on Bremsstrahlung Isochromat Spectroscopy in the VUV range: "The physics involved may be most simply described as an inverse photoelectric effect." The first experiments provided surface-sensitive information on the density of unoccupied states. Later, momentum and spin resolution were added to investigate the spin-dependent E(k) dispersion of unoccupied electron states. During five decades, the technique was further developed by several groups worldwide to enhance the intensity and improve the resolution in energy, momentum, and spin. A wealth of information was gained about metals, semiconductors, ultrathin films as well as adsorbate systems. The experimental studies were accompanied by several theoretical approaches, which are able to accurately describe the unoccupied electronic structure and model the inverse photoemission process. In 2012, H. Yoshida extended the energy range to the near-UV range (low-energy inverse photoemission), which is especially suited to study organic samples due to a lower damage risk caused by the exciting electron beam.

Current research fields for inverse photoemission are, e.g., spin textures of exchange- and/or spin-orbit-induced influenced systems and topological insulators, gap structures in transition metal dichalcogenides, LUMO levels in semiconductors for photovoltaic applications, electronic structure of atomic-layer and quantum materials. This focus session will highlight recent advances obtained by inverse photoemission in different fields and material systems. Also, it will bring together researchers from different areas for addressing current trends and future applications of inverse photoemission from experimental as well as theoretical perspective.

Organized by Markus Donath, Fabian Schöttke and Peter Krüger (U Münster).

	15:00	O 67.1	Hauptvortrag: New frontiers of one step model of photoemission for quantum materials — •Jan Minar
	15:30	O 67.2	Surface-orientation-dependent unoccupied electronic states of Fe3O4 — •Jan Bieling and Markus Donath
	15:45	O 67.3	Beyond the surface: Probing electronic structure with IPES in Valparaíso-Chile — Patricia Martínez, Rolando. Esparza, Jonathan Correa-Puerta, Valeria del Campo, Ricardo Henríquez, •Patricio Häberle, Sanber Viscaya, Eric Suárez-Morell, Patricio Vargas, Jean F. Veyan, Marcos Flores, and Samuel Hevia
	16:00	O 67.4	Inverse photoemission studies of unoccupied electronic states of various Si(111)-based surfaces and interfaces — Younal Ksari, Hela Mrezguia, and •Jean-Marc Themlin
	16:15	O 67.5	Layer-Dependent Electronic Signatures of Tl on Ag(111) Revealed by Inverse Photoemission — •Sarah Laufer, Sven Schemmelmann, Yuichiro Toichi, Kazuyuki Sakamoto, and Markus Donath
	16:30	O 67.6	Modeling a transient Dirac-like surface state in Floquet-driven SnTe — •Aki Pulkkinen, Frédéric Chassot, Hugo Dil, Claude Monney, and Ján Minár
	16:45	O 67.7	Peak separation analysis for inverse photoelectron spectra: Comparing second derivative, curve fitting, and deconvolution — •ryotaro nakazawa, haruki sato, and hiroyuki yoshida
	17:00	O 67.8	The role of light polarization in inverse photoemission — •Marcel Holtmann, Pascal J. Grenz, and Markus Donath
	17:15	O 67.9	Sub-100 meV low-energy inverse photoelectron spectroscopy using an electrostatic monochromator — •Tomoko Onishi, Taichi Suruga, Daichi Honma, Masaya Kai, Issei Ishimori, François C. Bocquet, F. Stefan Tautz, Harald Ibach, and Hiroyuki Yoshida
	17:30	O 67.10	Towards high resolution IPES in the VUV range — Giacomo Merzoni, Samuele Comizzoli, Giacomo Panzera, Lucio Braicovich, and •Giacomo Ghiringhelli
	17:45	O 67.11	2D IPES intensity maps of MoS2 — •Patricia Martínez-Rojas, Sanber Vizcaya, Rolando Esparza, and Patricio Häberle