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TT: Fachverband Tiefe Temperaturen
TT 91: 2D Materials VII: Heterostructures (joint session O/TT)
TT 91.1: Talk
Friday, March 22, 2024, 10:30–10:45, MA 005
Defect-free two-dimensional core-shell heterostructures: MoS2-TaS2/Au(111) — Kai Mehlich1,2, Mahdi Ghorbani-Asl3, Daniel Sahm4, Thais Chagas4, Daniel Weber1, Catherine Grover1, Daniela Dombrowski1,2, Arkady Krasheninnikov3, and •Carsten Busse1,2 — 1Department Physik, Universität Siegen, Germany — 2Institut für Materialphysik, Universität Münster, Germany — 3Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 4Department Bauingenieurwesen, Universität Siegen, Germany
We prepared two-dimensional core-shell heterostructures of the monolayer transition metal dichalcogenides (TMDCs) MoS2 and TaS2 by reactive molecular beam epitaxy (MBE) on chemically inert and weakly interacting Au(111). The heterostructures are in a size regime where quantum confinement can be expected. Despite large lattice mismatch a seamless interconnection of the two materials has been achieved, confirming successful encapsulation of the semiconducting core by a metallic shell. The resulting strain is analyzed on the atomic scale using scanning tunneling microscopy (STM) and compared to continuum models as well as simulations unsing empirical potentials.
Keywords: transition metal dichalcogenides; STM; 2D materials; heterostructures; MoS2