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19 April 2024

» arxiv » 1510.8430

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Spin polarization and texture of the Fermi arcs in the Weyl Fermion semimetal TaAs
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 ; Yiyang Feng ; Tay-Rong Chang ; Nasser Alidoust ; Hao Zheng ; Chi-Cheng Lee ; Shin-Ming Huang ; Chuang-Han Hsu ; Horng-Tay Jeng ; Arun Bansil ; Aris Alexandradinata ; Titus Neupert ; Takeshi Kondo ; Shik Shin ; Hsin Lin ; Shuang Jia ; M. Zahid Hasan ;
Date:	28 Oct 2015
Abstract:	A Weyl semimetal is a new state of matter that host Weyl fermions as quasiparticle excitations. The Weyl fermions at zero energy correspond to points of bulk band degeneracy, 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 possesses a spin texture that is completely in-plane. 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 non-degenerate property of the Fermi arcs is important for the establishment of its exact topological nature, which reveal 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.
Source:	arXiv, 1510.8430
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