Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2

被引：191

作者：

Fei, Fucong ^{[1
]}

Bo, Xiangyan ^{[1
]}

Wang, Rui ^{[1
]}

Wu, Bin ^{[1
]}

Jiang, Juan ^{[2
]}

Fu, Dongzhi ^{[1
]}

Gao, Ming ^{[3
]}

Zheng, Hao ^{[4
]}

Chen, Yulin ^{[2
,5
]}

Wang, Xuefeng ^{[3
]}

Bu, Haijun ^{[1
]}

Song, Fengqi ^{[1
]}

Wan, Xiangang ^{[1
]}

Wang, Baigeng ^{[1
]}

Wang, Guanghou ^{[1
]}

机构：

[1] Nanjing Univ, Coll Phys, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] ShanghaiTech Univ, CAS Shanghai Sci Res Ctr, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China

[3] Nanjing Univ, Sch Elect Sci & Engn, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[4] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[5] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 04期

基金：

中国国家自然科学基金;

关键词：

WEYL FERMION SEMIMETAL; SUPERCONDUCTIVITY; DISCOVERY; SURFACE; INTERFERENCE; ARCS;

D O I：

10.1103/PhysRevB.96.041201

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on a systematic study of type-II Dirac fermions in a layered crystal of PdTe2. De Haas-van Alphen oscillations show a small Fermi-surface pocket with a cross section of 0.077 nm(-2) with a nontrivial Berry phase. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. We propose that PdTe2 is an improved platform to host topological superconductors.

引用

页数：7

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