Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Interaction with VUV and X-ray light

A 28.8: Vortrag

Donnerstag, 14. März 2019, 12:15–12:30, S HS 3 Physik

Extreme Ultraviolet Core-Exciton Dynamics in Two-dimensional Molybdenum Disulfide — •Michael Zürch^1,8, Hung-Tzu Chang¹, Alexander Guggenmos¹, Diana Y. Qiu^2,3, Romain Geneaux¹, Yen-Chang Chen^4,5, Xuan Wei⁵, Chang-Ming Jiang^6,7, Yufeng Liang⁴, Felipe H da Jornada^2,3, Adam Schwartzberg⁴, David Prendergast⁴, Vincent C. Tung⁵, Steven G. Louie^2,3, Daniel M. Neumark^1,6, and Stephen R. Leone^1,2,6 — ¹Department of Chemistry, University of California, Berkeley, USA — ²Department of Physics, University of California, Berkeley, USA — ³Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA — ⁴Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, USA — ⁵School of Engineering, University of California, Merced, USA — ⁶Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA — ⁷Joint Center of Artificial Photosynthesis, LBNL, Berkeley, USA — ⁸Fritz Haber Institute of the Max Planck Society, Berlin, Germany

Novel tightly-bound core-excitons triggered by an XUV attosecond pulse are observed in two-dimensional transition-metal dichalcogenide molybdenum disulfide. State-of-the-art theory calculations confirm the observed features. The dynamics observed in the core-exciton states between the molybdenum 4p and 4d states indicate coherences, and population transfer between different states. The observation of strongly enhanced long-lived core excitons in two-dimensional semiconductors paves the way for further exploration into the properties of core excitons in two-dimensional materials and potential application of these.