Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 38: Ultrafast electron dynamics at surface and interfaces II
O 38.7: Talk
Tuesday, March 10, 2026, 12:00–12:15, TRE/MATH
Spin-orbit entangled exciton formation in a 2D correlated semiconductor — •Tania Mukherjee1,2, Lawson T. Lloyd1, Alessandro De Vita1,2, Martin Wolf1, Laurenz Rettig1, Ralph Ernstorfer1,2, and Tommaso Pincelli1,2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2Technische Universität Berlin, Berlin, Germany
Excitons govern the magneto-optical properties in spin-ordered 2D materials. NiPS3, a layered antiferromagnetic semiconductor, has recently gained significant attention because of its unconventional excitonic behaviour. Previous literature suggests that excitons are composed of bound electron and holes pairs in a highly spin and orbitally entangled Zhang-Rice-singlet state, resulting in strong coupling with the underlying magnetic ordering.However, the microscopic mechanism that governs the exciton formation remains elusive and unexplored. Using time- and angle-resolved photoemission spectroscopy, we map the electronic structure and the excited state dynamics of NiPS3 across the magnetic phase transition and, for the first time, observe directly the long-lived exciton footprint below the Néel temperature. This paves the way for exploring similarly complex excitonic behavior in other layered correlated materials.
Keywords: 2D materials; Excitons; trARPES