Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2

doi:10.1038/s41535-018-0112-5

	Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2
	Iaia, Davide 1,2; Chang, Guoqing 3; Chang, Tay-Rong 4; Hu, Jin 5; Mao, Zhiqiang 5; Lin, Hsin 3; Yan, Shichao6 ; Madhavan, Vidya 1,2
	2018-08-20
发表期刊	NPJ QUANTUM MATERIALS
ISSN	2397-4648
卷号	3
发表状态	已发表
DOI	10.1038/s41535-018-0112-5
摘要	Weyl semimetals display a novel topological phase of matter where the Weyl nodes emerge in pairs of opposite chirality and can be seen as either a source or a sink of Berry curvature. The exotic effects in Weyl semimetals, such as surface Fermi arcs and the chiral anomaly, make them a new playground for exploring novel functionalities. Further exploiting their potential applications requires dear understanding of their topological electronic properties. Here we report a Fourier transform scanning tunneling spectroscopy (FT-STS) study on a type-II Weyl semimetal candidate MoTe2 whose Weyl points are predicated to be located above Fermi level. Although its electronic structure below the Fermi level has been identified by angle resolved photo emission spectroscopy, by comparing our experimental data with first-principles calculations, we are able to identify the origins of multiple scattering channels both below and above Fermi level. Our calculations also show the existence of both trivial and topological arc-like states above the Fermi energy. In the FT-STS experiments, we have observed strong signals from intra-arc scatterings as well as from the scattering between the arc-like surface states and the projected bulk states. A detailed comparison between our experimental observations and calculated results reveals the trivial and non-trivial scattering channels are difficult to distinguish in this compound. Interestingly, we find that the broken inversion symmetry changes the terminating states on the two inequivalent surfaces, which in turn changes the relative strength of the scattering channels observed in the FT-STS images on the two surfaces.
收录类别	ESCI ; SCIE ; SCI
语种	英语
资助项目	US Department of Energy[DE-SC0014208]
WOS研究方向	Physics
WOS类目	Quantum Science & Technology
WOS记录号	WOS:000449702700001
出版者	SPRINGERNATURE
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/45767
专题	物质科学与技术学院_PI研究组_颜世超组
通讯作者	Yan, Shichao; Madhavan, Vidya
作者单位	1.Univ Illinois, Dept Phys, Urbana, IL 61801 USA 2.Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA 3.Acad Sinica, Inst Phys, Taipei 11529, Taiwan 4.Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan 5.Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70018 USA 6.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Iaia, Davide,Chang, Guoqing,Chang, Tay-Rong,et al. Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2[J]. NPJ QUANTUM MATERIALS,2018,3.
APA	Iaia, Davide.,Chang, Guoqing.,Chang, Tay-Rong.,Hu, Jin.,Mao, Zhiqiang.,...&Madhavan, Vidya.(2018).Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2.NPJ QUANTUM MATERIALS,3.
MLA	Iaia, Davide,et al."Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe2".NPJ QUANTUM MATERIALS 3(2018).