论文标题
精致拓扑绝缘子的多细胞性
Multicellularity of delicate topological insulators
论文作者
论文摘要
对于拓扑绝缘子而言，Wannierizable并不是故事的终结。我们介绍了一个拓扑绝缘子家族，这些家族将被认为是由十倍的方式，拓扑量子化学和基于对称的指标的方法所设定的范式中的微不足道。尽管具有对称性，指数定位的Wannier表示，但每个Wannier函数都不能完全定位于整体中的单个原始单位单元。这种多细胞拓扑被证明既不稳定，也不是脆弱的，也没有脆弱的，即，通过将微不足道的带添加到价或传导带中可以无效。
Being Wannierizable is not the end of the story for topological insulators. We introduce a family of topological insulators that would be considered trivial in the paradigm set by the tenfold way, topological quantum chemistry, and the method of symmetry-based indicators. Despite having a symmetric, exponentially-localized Wannier representation, each Wannier function cannot be completely localized to a single primitive unit cell in the bulk. Such multicellular topology is shown to be neither stable, nor fragile, but delicate, i.e., the topology can be nullified by adding trivial bands to either valence or conduction band.
