Large optical conductivity of Dirac semimetal Fermi arc surface states

被引：14

作者：

Shi, Li-kun ^{[1
]}

Song, Justin C. W. ^{[1
,2
]}

机构：

[1] Agcy Sci Technol & Res, Inst High Performance Comp, Singapore 138632, Singapore

[2] Nanyang Technol Univ, Div Phys & Appl Phys, Singapore 637371, Singapore

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

CD3AS2; GRAPHENE;

D O I：

10.1103/PhysRevB.96.081410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fermi arc surface states, a hallmark of topological Dirac semimetals, can host carriers that exhibit unusual dynamics distinct from that of their parent bulk. Here we find that Fermi arc carriers in intrinsic Dirac semimetals possess a strong and anisotropic light-matter interaction. This is characterized by a large Fermi arc optical conductivity when light is polarized transverse to the Fermi arc; when light is polarized along the Fermi arc, Fermi arc optical conductivity is significantly muted. The large surface spectral weight is locked to the wide separation between Dirac nodes and persists as a large Drude weight of Fermi arc carriers when the system is doped. As a result, large and anisotropic Fermi arc conductivity provides a novel means of optically interrogating the topological surfaces states of Dirac semimetals.

引用

页数：5

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