教師資料查詢 | 類別: 期刊論文 | 教師: 李啟正 LEE, CHI-CHENG (瀏覽個人網頁)

標題: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
語言英文
ISSN
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別英國
公開徵稿
出版型式,電子版
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