Twist-Controlled Ferroelectricity and Emergent Multiferroicity in WSe2 Bilayers

Hassan, Y and Singh, B and Joe, M and Son, B-M and Ngo, TD and Jang, Y and Sett, S and Singha, A and Biswas, R and Bhakar, M and Watanabe, K and Taniguchi, T and Raghunathan, V and Sheet, G and Lee, Z and Yoo, WJ and Srivastava, PK and Lee, C (2024) Twist-Controlled Ferroelectricity and Emergent Multiferroicity in WSe2 Bilayers. In: Advanced Materials .

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Abstract

Recently, researchers have been investigating artificial ferroelectricity, which arises when inversion symmetry is broken in certain R-stacked, i.e., zero-degree twisted, van der Waals (vdW) bilayers. Here, the study reports the twist-controlled ferroelectricity in tungsten diselenide (WSe2) bilayers. The findings show noticeable room temperature ferroelectricity that decreases with twist angle within the range 0° < θ < 3°, and disappears completely for θ � 4°. This variation aligns with moiré length scale-controlled ferroelectric dynamics (0° < θ < 3°), while loss beyond 4° may relate to twist-controlled commensurate to non-commensurate transitions. This twist-controlled ferroelectricity serves as a spectroscopic tool for detecting transitions between commensurate and incommensurate moiré patterns. At 5.5 K, 3° twisted WSe2 exhibits ferroelectric and correlation-driven ferromagnetic ordering, indicating twist-controlled multiferroic behavior. The study offers insights into twist-controlled coexisting ferro-ordering and serves as valuable spectroscopic tools. © 2024 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Advanced Materials
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to publisher.
Keywords:	Ferroelectric materials; Ferromagnetism; Selenium compounds; Tungsten compounds, Bi-layer; Inversion symmetry; Length scale; Moire superlattix; Multiferroic behavior; Spectroscopic tool; Transition metal dichalogenide; Tungsten diselenide; Twist angles; Van der Waal, Van der Waals forces
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	26 Oct 2024 09:07
Last Modified:	26 Oct 2024 09:07
URI:	http://eprints.iisc.ac.in/id/eprint/86508

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