具有可调奇点的对称保护立方接触拓扑表面能带
Symmetry-protected cubic-touching topological surface bands with tunable singularities
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中文总结 AI 辅助
研究三维拓扑晶体绝缘体中具有对称保护立方接触的拓扑表面能带，通过调整粒子 - 空穴不对称性和各向异性实现能带色散连续变化及可调态密度奇点，为拓扑表面态强关联物质相工程提供平台并给出模型示例。
中文摘要 AI 辅助
我们提出了一类三维拓扑晶体绝缘体中的拓扑表面能带，其具有对称保护的立方阶能带接触。在对称约束下，通过调整粒子 - 空穴不对称性和各向异性，能带色散可在立方色散、护城河能带和具有范霍夫奇点的多小谷结构之间连续变化。因此存在一系列从幂律到对数发散的可调态密度奇点，为拓扑表面态中强关联物质相的工程提供了通用平台。我们在角动量为3/2电子的棱柱晶格紧束缚模型中给出了一个实现示例。
英文摘要
We propose a class of topological surface bands in three-dimensional topological crystalline insulators that have symmetry-protected cubic-order band touching. Within the symmetry constraint, the band dispersion can continuously vary between cubic dispersion, moat band and multi-mini-valley structure with van Hove singularities by adjusting particle-hole asymmetry and anisotropy. Thus, there is a family of tunable density-of-state singularities ranging from power-law to logarithmic divergences. This offrs a versatile platform for engineering strongly correlated phases of matter in topological surface states. We provide an example realization in a prism-lattice tight-binding model of angular-momentum-3/2 electrons.
