Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2

被引：56

作者：

Yao, M-Y ^{[1
]}

Xu, N. ^{[1
,2
,3
]}

Wu, Q. S. ^{[2
,4
]}

Autes, G. ^{[2
,4
]}

Kumar, N. ^{[5
]}

Strocov, V. N. ^{[1
]}

Plumb, N. C. ^{[1
]}

Radovic, M. ^{[1
]}

Yazyev, O., V ^{[2
,4
]}

Felser, C. ^{[5
]}

Mesot, J. ^{[1
,2
,6
]}

Shi, M. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[3] Wuhan Univ, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China

[4] Ecole Polytech Fed Lausanne, Natl Ctr Computat Design & Discovery Novel Mat MA, CH-1015 Lausanne, Switzerland

[5] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[6] Swiss Fed Inst Technol, Lab Solid State Phys, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 17期

基金：

国家重点研发计划; 瑞士国家科学基金会; 中国国家自然科学基金;

关键词：

FERMION SEMIMETAL; DISCOVERY; STATE; ARCS;

D O I：

10.1103/PhysRevLett.122.176402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Distinct to type-I Weyl semimetals (WSMs) that host quasiparticles described by the Weyl equation, the energy dispersion of quasiparticles in type-II WSMs violates Lorentz invariance and the Weyl cones in the momentum space are tilted. Since it was proposed that type-II Weyl fermions could emerge from (W, Mo)Te-2, and (W, Mo)P-2 families of materials, a large number of experiments have been dedicated to unveiling the possible manifestation of type-II WSMs, e.g., surface-state Fermi arcs. However, the interpretations of the experimental results are very controversial. Here, using angle-resolved photoemission spectroscopy supported by the first-principles calculations, we probe the tilted Weyl cone bands in the bulk electronic structure of WP2 directly, which are at the origin of Fermi arcs at the surfaces and transport properties related to the chiral anomaly in type-II WSMs. Our results ascertain that, due to the spin-orbit coupling, the Weyl nodes originate from the splitting of fourfold degenerate band-crossing points with Chem numbers C = +/- 2 induced by the crystal symmetries of WP2, which is unique among all the discovered WSMs. Our finding also provides a guiding line to observe the chiral anomaly that could manifest in novel transport properties.

引用

页数：5

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