Electromagnetic dressing of the electron energy spectrum of Au(111) at high momenta
| Autor: | G. S. Matthijs Jansen, Stefan Kehrein, David Schmitt, Christina Möller, M. Keunecke, Stefan Mathias, Sabine Steil, Tridev Mishra, Alexander Osterkorn, Daniel Steil, Marcel Reutzel, Wiebke Bennecke, Salvatore R. Manmana |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Phase transition Condensed Matter - Mesoscale and Nanoscale Physics Infrared Photoemission spectroscopy FOS: Physical sciences 02 engineering and technology Photoelectric effect 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Condensed Matter - Other Condensed Matter Momentum law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Physics::Atomic Physics Atomic physics 010306 general physics 0210 nano-technology Ultrashort pulse Quantum Other Condensed Matter (cond-mat.other) |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.161403 |
| Popis: | Light-engineering of quantum materials via electromagnetic dressing is considered an on-demand approach for tailoring electronic band dispersions and even inducing topological phase transitions. For probing such dressed bands, photoemission spectroscopy is an ideal tool, and we employ here a novel experiment based on ultrafast photoemission momentum microscopy. Using this setup, we measure the in-plane momentum-dependent intensity fingerprints of the electromagnetically-dressed sidebands from a Au(111) surface for s- and p-polarized infrared driving. We find that at metal surfaces, due to screening of the driving laser, the contribution from Floquet-Bloch bands is negligible, and the dressed bands are dominated by the laser-assisted photoelectric effect. Also, we find that in contrast to general expectations, s-polarized light can dress free-electron states at large photoelectron momenta. Our results show that the dielectric response of the material must carefully be taken into account when using photoemission for the identification of light-engineered electronic band structures. 19 pages: 6 pages letter with 4 figures, 13 pages SI with 5 figures |
| Databáze: | OpenAIRE |
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