论文标题
平面电动极化的独特Moiré纹理，以区分同质的Moiré起源
Distinct moiré textures of in-plane electric polarizations for distinguishing moiré origins in homobilayers
论文作者
论文摘要
在二进制化合物2D绝缘子/半导体中，例如六角形硝酸硼（HBN），原子的不同电子亲和力可以引起跨反转不对称的范德华瓦尔斯界面的非平面电极极化，该范围接近0度扭曲角。在这里，我们表明，在一般的堆叠顺序中，滑动损坏了平面内C3旋转对称性，界面电荷重新分布还导致平面电动极化，与平面外的电荷相当。在HBN双层以及具有栅极控制的层间电荷重新分布的偏置石墨烯双层中证明了效果。在长波长的莫伊尔模式中，由局部层间堆叠式构成构成拓扑的非平凡空间纹理确定的平面内电化极化。我们表明，这些纹理可以将不同起源的莫伊尔模式与扭曲，双轴和单轴 - 局部结构区分开，其中电极的矢量场分别具有Bloch-type Merons，Néel-type Merons和Anti type。可以进一步利用扭曲和异质的组合，以设计各种电动极化纹理，包括一维型晶格。
In binary compound 2D insulators/semiconductors such as hexagonal boron nitride (hBN), the different electron affinities of atoms can give rise to out-of-plane electric polarizations across inversion asymmetric van der Waals interface of near 0-degree twist angles. Here we show that at a general stacking order where sliding breaks the in-plane C3 rotational symmetry, the interfacial charge redistribution also leads to an in-plane electric polarization, with a comparable magnitude to that of the out-of-plane ones. The effect is demonstrated in hBN bilayers, as well as in biased graphene bilayers with the gate-controlled interlayer charge redistribution. In long wavelength moiré patterns, the in-plane electric polarizations determined by the local interlayer stacking registries constitute topologically nontrivial spatial textures. We show that these textures can distinguish moiré patterns of different origins from twisting, biaxial- and uniaxial-heterostrain, where vector fields of the electric polarizations feature Bloch-type merons, Néel-type merons, and anti-merons, respectively. Combinations of twisting and heterostrain can further be exploited for engineering various electric polarization textures including 1D quasiperiodic lattices.
