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Phys Rev Lett. 2015 Nov 20;115(21):217601. doi: 10.1103/PhysRevLett.115.217601. Epub 2015 Nov 16.

Observation of Fermi-Arc Spin Texture in TaAs.

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Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Collaborative Innovation Center of Quantum Matter, Beijing, China.
Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland.


We have investigated the spin texture of surface Fermi arcs in the recently discovered Weyl semimetal TaAs using spin- and angle-resolved photoemission spectroscopy. The experimental results demonstrate that the Fermi arcs are spin polarized. The measured spin texture fulfills the requirement of mirror and time-reversal symmetries and is well reproduced by our first-principles calculations, which gives strong evidence for the topologically nontrivial Weyl semimetal state in TaAs. The consistency between the experimental and calculated results further confirms the distribution of chirality of the Weyl nodes determined by first-principles calculations.

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