论文标题
氯化钠的分数角电荷
Fractional Corner Charge of Sodium Chloride
论文作者
论文摘要
高阶拓扑阶段的最新发展已经阐明了散装中的非平凡多重力矩与边界处分数量化电荷的出现之间的关系。在这里，我们在桌子上放置了三维八度绝缘子的建议，其分数量化的角电荷$ \ pm E/8 $：氯化钠，通常称为茶盐。拐角电荷的分数量化不受每个离子电荷的量子波动的影响，因为我们通过从头开始计算明确证明了。我们进一步表明，即使理想的晶体撒上缺陷，分数电荷的静电特征也保存得很好，并提供了有关如何从源自现实表面弛豫的电场校正中分离出角电荷贡献的系统分析。我们的结果表明，从固体中量化的多极矩的角度电荷的观察可能在拐角处。
Recent developments in higher-order topological phases have elucidated on the relationship between nontrivial multipole moments in the bulk and the emergence of fractionally quantized charges at the boundary. Here, we put on the table a proposal of the three-dimensional octupole insulator with fractionally quantized corner charges $\pm e/8$: sodium chloride, commonly known as table salt. The fractional quantization of the corner charge is unaffected by the quantum fluctuation of the electric charge per ion, as we demonstrate explicitly with ab initio calculations. We further show that the electrostatic signature of the fractional charge is well-preserved even when the ideal crystal is sprinkled with defects, and provide a systematic analysis on how the corner charge contribution could be isolated from the electric-field corrections originating from realistic surface relaxation. Our results suggest that the observation of corner charges from quantized multipole moments in solids might be around the corner.
