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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Two-dimensional Materials IV (joint session HL/CPP)

HL 48.11: Vortrag

Freitag, 5. April 2019, 12:15–12:30, H36

Extreme Ultraviolet Core-Exciton Dynamics in Two-dimensional Molybdenum Disulfide — •Michael Zürch1,8, Hung-Tzu Chang1, Alexander Guggenmos1, Diana Y. Qiu2,3, Romain Geneaux1, Yen-Chang Chen4,5, Xuan Wei5, Chang-Ming Jiang6,7, Yufeng Liang4, Felipe H da Jornada2,3, Adam Schwartzberg4, David Prendergast4, Vincent C. Tung5, Steven G. Louie2,3, Daniel M. Neumark1,6, and Stephen R. Leone1,2,61Department 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.

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