Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 74: Poster IIIA
HL 74.14: Poster
Thursday, March 19, 2020, 15:00–17:30, P2/2OG
Manipulating transition-metal dichalcogenide monolayers with proximity effects — •Lanqing Zhou1,2, Sven Borghardt1,2, Detlev Grützmacher1,2, and Beata Kardynal1,2 — 1PGI-9, Forschungszentrum Jülich, Julich, Germany — 2Department of Physics, RWTH Aachen University, 52074 Aachen, Germany
Transition-Metal Dichalcogenides (TMDs) monolayers have been shown to exhibit many interesting physical properties related to their crystal structure and strong spin-orbit interactions. In addition,their properties can be manipulated using proximity fields generated when they are placed in contact with functional molecules or films.Here we interface molybdenum diselenide and tungsten diselenide monolayers with thin films of chromium triiodide and chromium trichloride. Both chromium trihalides (CrX3, X =Cl,I) are layered materials which are electronic insulators that are also ferromagnetic at low temperatures. In this contribution, we examine the effects of proximity magnetic field and the band alignment between W(Mo)Se2 and CrX3 on the excitonic states in the heterostructure. The excitonic states are probed via temperature dependent and polarization resolved photoluminescence. We show that both type-I and type-II heterostructures can be fabricated using different combination of monolayers of TDMs and CrX3. We will also show that in the type-II heterostructure the dominant effects originate from the charge transfer between the two component materials. Finally, we explore the use electric field to manipulate the charge separated complexes.