Journal
SCIENCE
Volume 357, Issue 6357, Pages 1274-1277Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aam9598
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Funding
- German Research Foundation (DFG) within the Collaborative Research Center [(SFB) 613]
- German Research Foundation (DFG) within the Priority Program SPP 1931
- German Research Foundation (DFG) within the Priority Program SPP 1840
- Basque Government [IT-756-13 UPV/EHU]
- Spanish Ministerio de Economia y Competitividad [FIS2016-76617-P, FIS2016-76471-P]
- Fondo Europeo de Desarrollo Regional (FEDER) [CTQ2016-80375-P]
- European XFEL
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Attosecond time-resolved photoemission spectroscopy reveals that photoemission from solids is not yet fully understood. The relative emission delays between four photoemission channels measured for the van der Waals crystal tungsten diselenide (WSe2) can only be explained by accounting for both propagation and intra-atomic delays. The intra-atomic delay depends on the angular momentum of the initial localized state and is determined by intra-atomic interactions. For the studied case of WSe2, the photoemission events are time ordered with rising initial-state angular momentum. Including intra-atomic electron-electron interaction and angular momentum of the initial localized state yields excellent agreement between theory and experiment. This has required a revision of existing models for solid-state photoemission, and thus, attosecond time-resolved photoemission from solids provides important benchmarks for improved future photoemission models.
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