Twist piezoelectricity: giant electromechanical coupling in magic-angle twisted bilayer LiNbO3

Hulin Yao, Pengcheng Zheng, Shibin Zhang (), Chuanjie Hu, Xiaoli Fang, Liping Zhang, Dan Ling, Huanyang Chen () and Xin Ou ()
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Hulin Yao: Chinese Academy of Sciences
Pengcheng Zheng: Chinese Academy of Sciences
Shibin Zhang: Chinese Academy of Sciences
Chuanjie Hu: Xiamen University
Xiaoli Fang: Chinese Academy of Sciences
Liping Zhang: Chinese Academy of Sciences
Dan Ling: Chinese Academy of Sciences
Huanyang Chen: Xiamen University
Xin Ou: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Twisted a pair of stacked two-dimensional materials exhibit many exotic electronic and photonic properties, leading to the emergence of flat-band superconductivity, moiré engineering and topological polaritons. These remarkable discoveries make twistronics the focus point of tremendous interest, but mostly limited to the concept of electrons, phonons or photons. Here, we present twist piezoelectricity as a fascinating paradigm to modulate polarization and electromechanical coupling by twisting precisely the stacked lithium niobate slabs due to the interlayer coupling effect. Particularly, the inversed and twisted bilayer lithium niobate is constructed to overcome the intrinsic mutual limitation of single crystals and giant effective electromechanical coupling coefficient $${k}_{t}^{2}$$ k t 2 is unveiled at magic angle of $$111^\circ$$ 11 1 ∘ , reaching 85.5%. Theoretical analysis based on mutual energy integrals shows well agreements with numerical and experimental results. Our work opens new venues to flexibly control multi-physics with magic angle, stimulating progress in wideband acoustic-electric, and acoustic-optic components, which has great potential in wireless communication, timing, sensing, and hybrid integrated photonics.

Date: 2024
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DOI: 10.1038/s41467-024-49321-x

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