Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.096801
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Funding
- Gordon and Betty Moore Foundations Emergent Phenomena in Quantum Systems Initiative [GBMF4547]
- Photon and Quantum Basic Research Coordinated Development Program from MEXT
- JSPS [26287061, 24740197]
- National Basic Research Program of China [2013CB921901, 2014CB239302]
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-FG-02-05ER46200]
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under NRF [NRF-NRFF2013-03]
- National Science Council, Taiwan
- DOE/BES [DE-FG02-07ER46352]
- DOE [DE-AC02-05CH11231]
- University of Central Florida
- Los Alamos National Laboratory through the Laboratory Directed Research and Development program
- Grants-in-Aid for Scientific Research [15K17675, 16H00979, 16H06013, 16H02209, 24740197, 16K13829, 26287061] Funding Source: KAKEN
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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 (similar to 80%) may be useful in spintronic applications.
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