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    题名: Magnetic-tunnelling-induced Weyl node annihilation in TaP
    作者: Zhang, Cheng-Long;Xu, Su-Yang;Wang, C. M.;Lin, Ziquan;Du, Z. Z.;Guo, Cheng;Lee, Chi-Cheng;Lu, Hong;Feng, Yiyang;Huang, Shin-Ming;Chang, Guoqing;Hsu, Chuang-Han;Liu, Haiwen;Lin, Hsin;Li, Liang;Zhang, Chi;Zhang, Jinglei;Xie, Xin-Cheng;Neupert, Titus;Hasan, M. Zahid;Lu, Hai-Zhou;Wang, Junfeng;Jia, Shuang
    日期: 2017-07-10
    上传时间: 2019-10-03 12:11:00 (UTC+8)
    出版者: Springer Nature Limited
    摘要: Weyl nodes are topological objects in three-dimensional metals. Whereas the energy of the lowest Landau band of a conventional Fermi pocket increases with magnetic field due to the zero-point energy (1/2ℏω), the lowest Landau band of Weyl cones stays at zero energy unless a strong magnetic field couples Weyl fermions of opposite chirality. In the Weyl semimetal TaP, which possesses two types of Weyl nodes (four pairs of W1 and eight pairs of W2 nodes), we observed such a magnetic coupling between the electron pockets arising from the W1 Weyl fermions. As a result, their lowest Landau bands move above the chemical potential, leading to a sharp sign reversal in the Hall resistivity at a specific magnetic field corresponding to the separation in momentum space of the W1 Weyl nodes, . By contrast, annihilation is not observed for the hole pocket because the separation of the W2 Weyl nodes is much larger. These findings reveal the nontrivial topology of Weyl fermions in high-field transport measurements and demonstrate the observation of Weyl node annihilation, which is a unique topological phenomenon associated with Weyl fermions.
    關聯: Nature Physics 13, 979
    DOI: 10.1038/nphys4183
    显示于类别:[物理學系暨研究所] 期刊論文

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