Double-Weyl Phonons in Transition-Metal Monosilicides

We employed ab initio calculations to identify a class of crystalline materials of MSi (M=Fe, Co, Mn, Re, Ru) having double-Weyl points in both their acoustic and optical phonon spectra. They exhibit novel topological points termed "spin-1 Weyl point" at the Brillouin zone center and "...

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Bibliographic Details
Published in:Physical review letters 2018-01, Vol.120 (1), p.016401-016401
Main Authors: Zhang, Tiantian, Song, Zhida, Alexandradinata, A, Weng, Hongming, Fang, Chen, Lu, Ling, Fang, Zhong
Format: Article
Language:English
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Summary:We employed ab initio calculations to identify a class of crystalline materials of MSi (M=Fe, Co, Mn, Re, Ru) having double-Weyl points in both their acoustic and optical phonon spectra. They exhibit novel topological points termed "spin-1 Weyl point" at the Brillouin zone center and "charge-2 Dirac point" at the zone corner. The corresponding gapless surface phonon dispersions are two helicoidal sheets whose isofrequency contours form a single noncontractible loop in the surface Brillouin zone. In addition, the global structure of the surface bands can be analytically expressed as double-periodic Weierstrass elliptic functions.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.016401