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Observation of Double Weyl Phonons in Parity-Breaking FeSi

Authors :
Miao, H.
Zhang, T. T.
Wang, L.
Meyers, D.
Said, A. H.
Wang, Y. L.
Shi, Y. G.
Weng, H. M.
Fang, Z.
Dean, M. P. M.
Source :
Phys. Rev. Lett. 121, 035302 (2018)
Publication Year :
2018

Abstract

Condensed matter systems have now become a fertile ground to discover emerging topological quasi-particles with symmetry protected modes. While many studies have focused on Fermionic excitations, the same conceptual framework can also be applied to bosons yielding new types of topological states. Motivated by the recent theoretical prediction of double-Weyl phonons in transition metal monosilicides [Phys. Rev. Lett. 120, 016401 (2018)], we directly measured the phonon dispersion in parity-breaking FeSi using inelastic x-ray scattering. By comparing the experimental data with theoretical calculations, we make the first observation of double-Weyl points in FeSi, which will be an ideal material to explore emerging Bosonic excitations and its topologically non-trivial properties.<br />Comment: 5 pages and 4 figures

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 121, 035302 (2018)
Publication Type :
Report
Accession number :
edsarx.1804.10676
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.121.035302