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HL: Fachverband Halbleiterphysik

HL 9: 2D semiconductors and van der Waals heterostructures I (joint session HL/DS/O)

HL 9.2: Vortrag

Montag, 16. März 2020, 09:45–10:00, POT 81

Theory of synchrotron-based spectroscopic techniques on two-dimensional materials — •Dominik Christiansen, Malte Selig, and Andreas Knorr — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

High energy radiation enables the spectroscopic analysis of core level electronic excitations.

First, we develop a theoretical framework for X-ray absorption spectroscopy (XAS) including electronic and structural information obtained from near-edge XAS and extended XAS [1]. Analysing graphene as exemplary material, we show that the characteristic behaviour of the XAS spectra can be derived from the semi-empirical tight-binding approach by considering the spatially non local light-matter interaction.

Second, we develop a theory of exciton dynamics in time and angle resolved photoemission spectroscopy investigating the exciton formation and thermalization in ultrathin transition-metal dichalcogenides [2,3].

[1] B. Buades et al., Optica 5, 000502 (2018)

[2] D. Christiansen et al., Phys. Rev. B 100, 205401 (2019)

[3] M. Selig et al., 2D Mater. 5, 035017 (2018)