Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Ultrafast electron dynamics at surface and interfaces III

O 66.5: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, TRE/MATH

Attosecond spin-orbit delays in solid-state photoemission — •Andreas Gebauer¹, Walter Enns¹, Sergej Neb², Tillmann Schabbehard¹, Luis Maschmann¹, J. Hugo Dil³, Ulrich Heinzmann¹, Stephan Fritzsche^4,5,6, Nikolay M. Kabachnik^7,8, Eugene E. Krasovskii^8,9,10, and Walter Pfeiffer¹ — ¹Bielefeld University — ²ETH Zurich — ³EPFL, Lausanne — ⁴Helmholtz Institute Jena — ⁵GSI Helmholtzzentrum für Schwerionenforschung GmbH — ⁶Friedrich-Schiller-University Jena — ⁷European XFEL GmbH, Schenefeld — ⁸DIPC, San Sebastián — ⁹Universidad del País Vasco, San Sebastián — ¹⁰IKERBASQUE, Bilbao

Attosecond time-resolved photoelectron spectroscopy allows observation of photoemission dynamics in solids on its natural time scale. Photoelectrons typically need tens to hundreds of attoseconds to be released into the vacuum while various competing effects determine the emission dynamics. We report the first observation of unexpectedly large spin-orbit delays, i.e. relative photoemission delays between spin-orbit split core levels in Bi₂Te₃ and Bi₂Se₃. The observed delays can neither be attributed to intra-atomic delays nor to ballistic photoelectron transport. Instead, calculations based on one-step photoemission theory reveal that strong variations of the final state wave function on the energy scale of the spin-orbit splitting are responsible for the experimental observation. These variations reflect the complex interplay of propagating and evanescent waves in the photoelectron emission, exhibiting qualitatively different emission dynamics.

Keywords: attosecond; photoelectron; time-resolved photoemission; topological insulator