TY - JOUR
T1 - Weyl Node and Spin Texture in Trigonal Tellurium and Selenium
AU - Hirayama, Motoaki
AU - Okugawa, Ryo
AU - Ishibashi, Shoji
AU - Murakami, Shuichi
AU - Miyake, Takashi
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/5/22
Y1 - 2015/5/22
N2 - We study Weyl nodes in materials with broken inversion symmetry. We find based on first-principles calculations that trigonal Te and Se have multiple Weyl nodes near the Fermi level. The conduction bands have a spin splitting similar to the Rashba splitting around the H points, but unlike the Rashba splitting the spin directions are radial, forming a hedgehog spin texture around the H points, with a nonzero Pontryagin index for each spin-split conduction band. The Weyl semimetal phase, which has never been observed in real materials without inversion symmetry, is realized under pressure. The evolution of the spin texture by varying the pressure can be explained by the evolution of the Weyl nodes in k space.
AB - We study Weyl nodes in materials with broken inversion symmetry. We find based on first-principles calculations that trigonal Te and Se have multiple Weyl nodes near the Fermi level. The conduction bands have a spin splitting similar to the Rashba splitting around the H points, but unlike the Rashba splitting the spin directions are radial, forming a hedgehog spin texture around the H points, with a nonzero Pontryagin index for each spin-split conduction band. The Weyl semimetal phase, which has never been observed in real materials without inversion symmetry, is realized under pressure. The evolution of the spin texture by varying the pressure can be explained by the evolution of the Weyl nodes in k space.
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U2 - 10.1103/PhysRevLett.114.206401
DO - 10.1103/PhysRevLett.114.206401
M3 - Article
AN - SCOPUS:84930226732
VL - 114
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 20
M1 - 206401
ER -