Observation of bulk states and spin-polarized topological surface states in transition metal dichalcogenide Dirac semimetal candidate NiTe2

被引：68

作者：

Ghosh, Barun ^{[1
]}

Mondal, Debashis ^{[2
,3
]}

Kuo, Chia-Nung ^{[4
]}

Lue, Chin Shan ^{[4
]}

Nayak, Jayita ^{[1
]}

Fujii, Jun ^{[2
]}

Vobornik, Ivana ^{[2
]}

Politano, Antonio ^{[5
,6
]}

Agarwal, Amit ^{[1
]}

机构：

[1] Indian Inst Technol Kanpur, Dept Phys, Kanpur 208016, Uttar Pradesh, India

[2] CNR, IOM, Lab TASC, Area Sci Pk,SS 14,Km 163-5, I-34149 Trieste, Italy

[3] Abdus Salaam Int Ctr Theoret Phys, Str Costiera 11, I-34100 Trieste, Italy

[4] Natl Cheng Kung Univ, Dept Phys, 1 Ta Hsueh Rd, Tainan 70101, Taiwan

[5] Univ Aquila, DSFC, Via Vetoio 10, I-67100 Laquila, Italy

[6] CNR, IMM, 8 Str 5, I-95121 Catania, Italy

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 19期

关键词：

DISCOVERY; PHOTOEMISSION; PDTE2;

D O I：

10.1103/PhysRevB.100.195134

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We predict NiTe2 to be a type-II Dirac semimetal based on ab initio calculations and explore its bulk and spin-polarized surface states using spin- and angle-resolved photoemission spectroscopy (spin-ARPES). Our results show that, unlike PtTe2, PtSe2, and PdTe2, the Dirac node in NiTe2 is located in close vicinity to the Fermi energy. Additionally, NiTe2 also hosts a pair of band inversions below the Fermi level along the Gamma -A high-symmetry direction, with one of them leading to a Dirac cone in the surface states. The bulk Dirac nodes and the ladder of band inversions in NiTe2 support unique topological surface states with chiral spin texture over a wide range of energies. Our work paves the way for the exploitation of the low-energy type-II Dirac fermions in NiTe2 in the fields of spintronics, infrared plasmonics, and ultrafast optoelectronics.

引用

页数：7

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