压电
Berry连接和曲率
凝聚态物理
量子霍尔效应
挠曲电
压电系数
极化(电化学)
材料科学
电场
物理
纳米技术
化学
磁场
几何相位
量子力学
声学
物理化学
作者
Yilimiranmu Rouzhahong,Chao Liang,Ji‐Huan He,Xinyi Lin,Biao Wang,Huashan Li
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-01-22
卷期号:24 (4): 1137-1144
标识
DOI:10.1021/acs.nanolett.3c03709
摘要
Piezoelectricity has been widely explored for nanoelectromechanical applications, yet its working modes are mainly limited in polar directions. Here we discover the intrinsic electro-mechanical response in crystal materials that is transverse to the conventional polarized direction, which is named unconventional piezoelectricity. A Hall-like mechanism is proposed to interpret unconventional piezoelectricity as charge polarization driven by a built-in electric field for systems with asymmetric Berry curvature distributions. Density functional theory simulations and statistical analyses justify such a mechanism and confirm that unconventional piezoelectricity is a general property for various two-dimensional materials with spin splitting or valley splitting. An empirical formula is derived to connect the conventional and unconventional piezoelectricity. The extended understanding of the piezoelectric tensor in quantum materials opens an opportunity for applications in multidirectional energy conversion, broadband operation, and multifunctional sensing.
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