Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Focus Session: Unoccupied States by Inverse Photoemission I

O 60.3: Vortrag

Mittwoch, 11. März 2026, 11:15–11:30, WILL/A317

A Retrospective on Spin-Resolved IPES in Milan — •Alberto Calloni, Gianlorenzo Bussetti, and Franco Ciccacci — Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

For over thirty years, the Milan group led by Franco Ciccacci has been a key contributor to the development of spin-resolved Inverse Photoemission Spectroscopy (SR-IPES), advancing both the experimental methods and the study of empty electronic states in solids and interfaces. The activity began in the early '90s, when a dedicated system for spin- and angle-resolved measurements was conceived and built in Milan, drawing on the experience gained earlier with one of the first IPES setups using a UV grating. The new apparatus, featuring a spin-polarized GaAs electron source and a solid-state photon detector that ensured efficient detection of the weak IPES signal, enabled the direct investigation of spin-dependent unoccupied states at a time when such studies were still in their infancy. Building on this capability, the group has carried out a broad range of SR-IPES studies on metallic surfaces, magnetic thin films and multilayers, addressing phenomena such as spin-polarized quantum-well states and surface- or interface-induced spin polarization. More recently, together with studies on systems in which spin-orbit effects define the spin texture of the unoccupied states, the IPES setup has also been applied to hybrid organic/inorganic and molecule/ferromagnet interfaces, offering insight into the stability of the unoccupied states and their possible modifications upon interaction with the surrounding environment.

Keywords: inverse photoemission; spin resolution; magnetic films; hybrid interfaces