Magnetic-tunnelling-induced Weyl node annihilation in TaP
學年 105
學期 2
出版（發表）日期 2017-07-10
作品名稱 Magnetic-tunnelling-induced Weyl node annihilation in TaP
作品名稱（其他語言）
著者 Cheng-Long Zhang; Su-Yang Xu; C. M. Wang; Ziquan Lin; Z. Z. Du; Cheng Guo; Chi-Cheng Lee; Hong Lu; Yiyang Feng; Shin-Ming Huang; Guoqing Chang; Chuang-Han Hsu; Haiwen Liu; Hsin Lin; Liang Li; Chi Zhang; Jinglei Zhang; Xin-Cheng Xie; Titus Neupert; M. Zahid Hasan; Hai-Zhou Lu; Junfeng Wang; Shuang Jia
單位
出版者
著錄名稱、卷期、頁數 Nature Physics 13, 979
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.
關鍵字
語言 en
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版
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