Invariants of disordered semimetals via the spectral localizer
Invariants of disordered semimetals via the spectral localizer
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DOI：
10.1209/0295-5075/ac1b65
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
H. Schulz-Baldes;T. Stoiber
中科院分区：
文献类型：
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作者：
H. Schulz-Baldes;T. Stoiber
谱定域器是把哈密顿量放在狄拉克陷阱中。对于拓扑绝缘体，它的谱不对称性等价于拓扑不变量，为数值计算提供了一个高效的工具。在这里，这种技术被扩展到无序半金属，并允许访问狄拉克或外尔点的数量以及弱不变量。这些后一种不变量意味着表面态的存在。
The spectral localizer consists in placing the Hamiltonian in a Dirac trap. For topological insulators its spectral asymmetry is equal to the topological invariants, providing a highly efficient tool for numerical computation. Here this technique is extended to disordered semimetals and allows to access the number of Dirac or Weyl points as well as weak invariants. These latter invariants imply the existence of surface states.