论文标题
通过面包车滑动的界面铁电性
Interfacial Ferroelectricity by van-der-Waals Sliding
论文作者
论文摘要
尽管它们具有离子性质，但许多分层的硅藻晶体通过在其最佳的抗平行面包车堆积中形成中心对称晶格，避免了内部电化极化。在这里，我们报告了在两个天然生长的六边形氮化物之间的界面处出现的稳定的铁电顺序，该二硝酸盐含量均匀，它们堆积在可稳定的非核对称平行方向中。我们观察到倒正式极化的交替域，这是由于域之间的一个晶格位点的横向移动引起的。通过扫描表面上方的有偏见的尖端，可以实现可逆的极化切换与横向滑动的结合。我们的计算将现象的起源追踪到电荷重新分布和离子位移之间的微妙相互作用，而我们的最小内聚力模型预测了进一步的场所，可以探索独特的“ slidetronics”切换。
Despite their ionic nature, many layered diatomic crystals avoid internal electric polarization by forming a centrosymmetric lattice at their optimal anti-parallel van-der-Waals stacking. Here, we report a stable ferroelectric order emerging at the interface between two naturally-grown flakes of hexagonal-boron-nitride, which are stacked together in a metastable non-centrosymmetric parallel orientation. We observe alternating domains of inverted normal polarization, caused by a lateral shift of one lattice site between the domains. Reversible polarization switching coupled to lateral sliding is achieved by scanning a biased tip above the surface. Our calculations trace the origin of the phenomenon to a subtle interplay between charge redistribution and ionic displacement, and our minimal cohesion model predicts further venues to explore the unique "slidetronics" switching.
