Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)

O 71.17: Poster

Mittwoch, 11. März 2026, 18:00–20:00, P2

Probing Electronic Structure Modulation in WSe₂ and MoTe₂ under Out-of-Plane Electric Fields via ARPES and XPS — •Sonja Reinheimer^1,2, •Katharina Steinkirchner^1,2, Adina Timm^1,2, Lukas Bruckmeier^1,2, Jakob Dilling^1,2, Jens Buck^1,2, Jana Kähler^1,2, Tim Riedel^1,2, Matthias Kalläne^1,2,3, Chithra Sharma^1,2, Markus Scholz⁴, and Kai Rossnagel^1,2,3 — ¹Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — ²Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — ³Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany — ⁴Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany

Transition metal dichalcogenides (TMDCs) are quantum materials that exhibit a broad spectrum of emergent electronic phenomena, arising from layer-dependent band structures. Owing to their tunable (opto-)electronic properties, TMDCs are promising candidates for next-generation photovoltaic devices and highly integrated electronic components. A key challenge is to systematically control charge transport and band alignment in these layered systems. Here, we investigate vertically stacked 2H-WSe₂/2H-MoTe₂ heterostructures using angle-resolved photoemission spectroscopy (ARPES) and X-ray photoelectron spectroscopy. By performing in-operando ARPES on a sample with an applied out-of-plane electric field during the measurements, we can directly probe field-induced modifications to the electronic band structure and the density of states. This approach enables us to identify electric-field-driven changes in the electronic and lattice structure and contribute to a deeper understanding of electric control mechanisms in TMDC heterostructures.

Keywords: ARPES; XPS; TMDC; WSe2; MoTe2