Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: 2D Materials 1: Electronic Structure of Transition Metal Dichalcogenides

O 48.10: Vortrag

Mittwoch, 7. September 2022, 17:15–17:30, S052

In Operando Soft X-Ray Photoemission Spectroscopy of 2D Material Devices — •Alena Nierhauve^1,2, Matthias Kalläne^1,2, Tammo Zimmermann¹, Jens Buck^1,2, Philipp Kagerer³, Zhansong Geng⁴, Chao Zhang⁴, Frank Schwierz⁴, Martin Ziegler⁴, Rok Venturini⁵, and Kai Rossnagel^1,2,6 — ¹IEAP, CAU Kiel, 24098 Kiel, Germany — ²Ruprecht-Haensel-Labor, DESY and CAU Kiel, 22607 Hamburg and 24098 Kiel, Germany — ³Dep. of Exp. Physics VII, JMU Würzburg, 97074 Würzburg, Germany — ⁴Dep. of Electr. Engineering and Information Techn., TU Ilmenau, 98684 Ilmenau, Germany — ⁵Jožef Stefan Institute, 1000 Ljubljana, Slovenia — ⁶DESY, 22607 Hamburg, Germany

Layered transition-metal dichalcogenides (TMDCs) are a particularly promising platform for low-dimensional electronic devices due to their two-dimensional nature and richness regarding physical phenomena. This includes non-linear conductance behavior due to, e.g., metal-insulator transitions and memristive behavior, which is of particular interest to in-memory computing designs for neuromorphic systems. By combination of micrometer position- and angle-resolved photoemission spectroscopy (µ-ARPES) in the soft X-ray range with in operando electrical control, we attempt to study the electronic structure changes concomitant with thickness changes and non-equilibrium conditions in device-like structures based on TMDCs. A portrayal of conductance-governing mechanisms at a fundamental level could help to evolve towards the understanding and engineering of novel band structures, transport phenomena, and device functionality.