Cedric Robert
CNRS-Researcher, Quantum Optoelectronics Laboratory of Physics and Chemistry of Nano-Objects – Toulouse, France
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For the past few years, 2D ferroelectric materials have attracted strong interest for their potential in future nanoelectronics devices. The recent discovery of 2D ferroelectricity in twisted layers of insulating hexagonal boron nitride [1-3], one of the most used 2D materials, has opened the
route to its integration into complex van der Waals heterostructures combining hybrid properties. In this presentation, we will show that opposite polarizations in ferroelectric domains of a folded hBN layer can imprint local n and p doping in a semiconducting transition metal dichalcogenide WSe2 monolayer, demonstrating that WSe2 can be used as an optical probe of ferroelectricity in hBN [4]. In the second part, we will present our first demonstration of domain switching through the application of an out-of-plane electric field and its optical probing with the WSe2 monolayer [5]. Our results establish the ferroelectric hBN/WSe2 van der Waals stacking as a promising optoelectronic structure.
[1] C. R. Woods et al., Nat Commun 12, 1 (2021).
[2] M. Vizner Stern et al., Science 372, 1462 (2021).
[3] K. Yasuda et al., Science 372, 1458 (2021).
[4] J. Fraunié et al., Physical Review Materials 7, L121002 (2023).
[5] S. Roux et al., Nano Letters 25, 321 (2025).
Email: cerobert@insa-toulouse.fr