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journal article·2018-06Open access

Raman Signatures of Broken Inversion Symmetry and In‐Plane Anisotropy in Type‐II Weyl Semimetal Candidate TaIrTe4

Yinan Liu, Qiangqiang Gu, Yu Peng, Shaomian Qi, Na Zhang, Yinong Zhang, Xiumei Ma, Rui Zhu, Lianming Tong, Ji Feng, Zheng Liu, Jian‐Hao Chen

Advanced Materials· Volume 30· Issue 25
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Abstract

Abstract The layered ternary compound TaIrTe4 is an important candidate to host the recently predicted type‐II Weyl fermions. However, a direct and definitive proof of the absence of inversion symmetry in this material, a prerequisite for the existence of Weyl Fermions, has so far remained evasive. Herein, an unambiguous identification of the broken inversion symmetry in TaIrTe4 is established using angle‐resolved polarized Raman spectroscopy. Combining with high‐resolution transmission electron microscopy, an efficient and nondestructive recipe to determine the exact crystallographic orientation of TaIrTe4 crystals is demonstrated. Such technique could be extended to the fast identification and characterization of other type‐II Weyl fermions candidates. A surprisingly strong in‐plane electrical anisotropy in TaIrTe4 thin flakes is also revealed, up to 200% at 10 K, which is the strongest known electrical anisotropy for materials with comparable carrier density, notably in such good metals as copper and silver.
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Research context

OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Iron-based superconductors research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

International Center for Quantum Materials School of Physics Peking University No. 5 Yiheyuan Road Beijing 100871 China

Centre for Programmed Materials School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

College of Chemistry and Molecular Engineering Peking University No. 5 Yiheyuan Road Beijing 100871 China

Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China

CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

Collaborative Innovation Center of Quantum Matter Beijing 100871 China

NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

Funding

National Natural Science Foundation of China · National Research Foundation Singapore

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