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DS: Fachverband Dünne Schichten
DS 7: 2D Materials and their Heterostructures III
DS 7.3: Talk
Wednesday, March 20, 2024, 10:00–10:15, A 053
Misfit Layer Compounds as Ultratunable Field Effect Transistors: From Charge Transfer Control to Emergent Superconductivity — •Ludovica Zullo1,2, Giovanni Marini1, Tristan Cren2, and Matteo Calandra1,2,3 — 1Department of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Italy — 2Sorbonne Université, CNRS, Institut des Nanosciences de Paris (INSP), UMR7588, F-75252 Paris, France — 3Graphene Labs, Fondazione Istituto Italiano di Tecnologia, Via Morego, I-16163 Genova, Italy
Misfit layer compounds (MCLs) are heterostructures composed of rocksalts units stacked with few layers transition metal dichalcogenides (TMDs) [1]. Because of the lattice mismatch and chemical bonding between constituents, bulk MLCs behave similarly to mono and bi layer TMDs, making it quasi-2D systems. In this work [2], by means of density functional theory, we show that misfits behave as a periodic arrangement of ultra-tunable field effect transistors with 2D features. We demonstrate how the charge injection into the TMD layers can be controlled by the chemistry of the rocksalt which always acts as electron donor. Finally, we establish a strategy to design emergent superconductivity and demonstrate its applicability in (LaSe)1.27(SnSe2)2, showing that superconductivity can emerge in MLCs formed by assembling non-superconducting rocksalts and TMDs.
[1] Gerrit Wiegers, Progress in Solid State Chemistry 24, 1 (1996)
[2] Ludovica Zullo, Giovanni Marini, Tristan Cren, Matteo Calandra Nano Lett. 2023, 23, 14, 6658-6663 (2023)
Keywords: 2D materials; Heterostructures; Doping; Superconductivity; Transition metal dichalcogenides