Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs
學年 104
學期 2
出版（發表）日期 2016-03-01
作品名稱 Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs
作品名稱（其他語言）
著者 Su-Yang Xu; Ilya Belopolski; Daniel S. Sanchez; Madhab Neupane; Guoqing Chang; Koichiro Yaji; Zhujun Yuan; Chenglong Zhang; Kenta Kuroda; Guang Bian; Cheng Guo; Hong Lu; Tay-Rong Chang; Nasser Alidoust; Hao Zheng; Chi-Cheng Lee; Shin-Ming Huang; Chuang-Han Hsu; Horng-Tay Jeng; Arun Bansil; Titus Neupert; Fumio Komori; Takeshi Kondo; Shik Shin; Hsin Lin; Shuang Jia; M. Zahid Hasan
單位
出版者
著錄名稱、卷期、頁數 Phys. Rev. Lett. 116, 096801
摘要 A Weyl semimetal is a new state of matter that hosts Weyl fermions as quasiparticle excitations. The Weyl fermions at zero energy correspond to points of bulk-band degeneracy, called Weyl nodes, which are separated in momentum space and are connected only through the crystal’s boundary by an exotic Fermi arc surface state. We experimentally measure the spin polarization of the Fermi arcs in the first experimentally discovered Weyl semimetal TaAs. Our spin data, for the first time, reveal that the Fermi arcs’ spin-polarization magnitude is as large as 80% and lies completely in the plane of the surface. Moreover, we demonstrate that the chirality of the Weyl nodes in TaAs cannot be inferred by the spin texture of the Fermi arcs. The observed nondegenerate property of the Fermi arcs is important for establishing its exact topological nature, which reveals that spins on the arc form a novel type of 2D matter. Additionally, the nearly full spin polarization we observed (∼80%) may be useful in spintronic applications.
關鍵字 Fermi surface;Spin polarization;Weyl fermions
語言 en_US
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 USA
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/117361 )