AI 中文总结
该研究提出堆垛调控压电干涉机制，结合第一性原理计算与广义金兹堡-朗道框架，在多层滑动铁电体中实现可调控的非线性压电效应，为层状材料可编程非线性机电学提供设计原理。
AI 中文摘要
设计非线性压电效应需要在不消除高阶机电响应的前提下抑制线性压电系数，但目前仍缺乏通用且可重构的实现途径。本文提出堆垛调控压电干涉作为多层滑动铁电体中的相关机制，结合第一性原理计算与广义金兹堡-朗道框架，表明每个层间间隙均为局部压电通道，其符号与大小由堆垛方式决定；同号通道的相长干涉产生线性主导响应，而异号通道的相消干涉可抑制线性系数同时保留有限的二次响应。典型的MoS₂与NiTe₂多层材料接近抛物线极限，其中BAAC堆垛的MoS₂相比CBA堆垛的MoS₂，线性-二次交叉应变降低了25倍；实验可实现的四层MoS₂滑动路径进一步连通了线性主导、二次主导及符号反转状态。本研究确定堆垛调控干涉为层状材料中可编程非线性机电学的设计原理。
英文摘要
Designing nonlinear piezoelectricity requires suppressing the linear piezoelectric coefficient without extinguishing higher-order electromechanical response, yet a general and reconfigurable route remains lacking. Here we introduce stacking-engineered piezoelectric interference as such a mechanism in multilayer sliding ferroelectrics. Combining first-principles calculations with a generalized Ginzburg--Landau framework, we show that each interlayer gap acts as a local piezoelectric channel whose sign and magnitude are determined by stacking. Constructive interference between same-signed channels produces a linear-dominated response, whereas destructive interference between oppositely signed channels suppresses the linear coefficient while preserving a finite quadratic response. Representative MoS$_2$ and NiTe$_2$ multilayers approach the parabolic limit, with BAAC-stacked MoS$_2$ reducing the linear-to-quadratic crossover strain by a factor of 25 relative to CBA-stacked MoS$_2$. Experimentally accessible tetralayer MoS$_2$ sliding pathways further connect linear-dominated, quadratic-dominated and sign-inverted states. Here, we identify stacking-engineered interference as a design principle for programmable nonlinear electromechanics in layered materials.
Comments9 pages, 4 figures; 16-page Supplementary Information included as an ancillary file
