Disorder-induced exceptional and hybrid point rings in Weyl/Dirac semimetals
Disorder-induced exceptional and hybrid point rings in Weyl/Dirac semimetals
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DOI：
10.1103/physrevb.100.245205
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发表时间：
2019-08
影响因子：
3.7
通讯作者：
T. Matsushita;Y. Nagai;S. Fujimoto
中科院分区：
文献类型：
--
作者：
T. Matsushita;Y. Nagai;S. Fujimoto
Weyl哈密顿量的非赫米性导致了Weyl例外环和Weyl例外环内的平坦带的实现。最近，非厄米物理的平台被扩展到准粒子具有有限寿命的多体或无序系统。在这里，我们阐明了无序Weyl半金属中对么正极限的偏离导致了Weyl例外环的产生，而与散射势的细节无关。在拓扑Dirac半金属的情况下，实现了复能量本征值的混合环和无涡度的平带。这种情况适用于任何Weyl或Dirac半金属。这些效应可以通过光电发射或准粒子干涉实验检测到。
Non-Hermiticity in Weyl Hamiltonian leads to the realization of Weyl exceptional rings and flat bands inside the Weyl exceptional rings. Recently, the platform of non-Hermitian physics is extended to many-body or disordered systems where quasiparticles possess finite lifetime. Here, we clarify that the deviation from unitarity limit in a disordered Weyl semimetal leads to the generation of Weyl exceptional rings regardless of the detail of the scattering potential. In the case of topological Dirac semimetals, hybrid rings and flat bands without vorticity of complex-energy eigenvalues are realized. This scenario is applicable to any Weyl or Dirac semimetals. These effects are detectable by using photoemission or quasiparticle interference experiments.