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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.18: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Manipulating transition-metal dichalcogenide monolayers with proximity effects — •Lanqing Zhou, Sven Borghardt, and Beata Kardynal — Forschungszentrum Jülich PGI-9,Jülich, 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, being only three atomic planes thin, their properties can be manipulated using proximity fields generated when they are placed in contact with functional molecules or films. Here we interface tungsten diselenide monolayers with thin films of chromium trichlotride and chromium tribromide. Both chromium trihalides are layered materials which are electronic insulators that are also ferromagnetic at low temperatures. As such, they can be used as functional substrates for the monolayer WSe2 to introduce energy splitting of the spin states in K and K* valleys of the monolayer. In this contribution, we study different sample preparation methods to maximize the stability of the chromium trihalide films. We use hexagonal boron nitride to protect the ferromagnetic films from the ambient humidity and thin graphite films to protect the TMD monolayers from the effects of charge fluctuations in the substrate that can cause inhomogeous broadening of the photoluminescence spectra. Effects of the ferromagnetic layers on the monolayers in the devices are investigated using optical spectroscopy at different temperatures.

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