Observation of Double Weyl Phonons in Parity-Breaking FeSi
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
Condensed matter systems have now become a fertile ground to discover emerging topological quasiparticles 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 Zhang et al.’s recent theoretical prediction of double Weyl phonons in transition metal monosilicides [Phys. Rev. Lett. 120, 016401 (2018)], in this paper we directly measure the phonon dispersion in parity-breaking FeSi using inelastic x-ray scattering. Finally, 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 nontrivial properties.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences; Chinese Academy of Sciences (CAS)
- Grant/Contract Number:
- SC0012704; AC02-06CH11357; 2016YFA0300600; 11674369; 11774399; XDB07020100; QYZDB-SSW-SLH043; 1047478
- OSTI ID:
- 1460696
- Alternate ID(s):
- OSTI ID: 1460886; OSTI ID: 1467437
- Report Number(s):
- BNL-207825-2018-JAAM; TRN: US1901900
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 3; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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