Observation of Double Weyl Phonons in Parity-Breaking FeSi
Abstract
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)], we directly measure 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 nontrivial properties.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Sponsoring Org.:
- 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)
- OSTI Identifier:
- 1460696
- Alternate Identifier(s):
- OSTI ID: 1460886; OSTI ID: 1467437
- Report Number(s):
- BNL-207825-2018-JAAM
Journal ID: ISSN 0031-9007; TRN: US1901900
- Grant/Contract Number:
- SC0012704; AC02-06CH11357; 2016YFA0300600; 11674369; 11774399; XDB07020100; QYZDB-SSW-SLH043; 1047478
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; topological phases of matter; topological materials; density functional theory; inelastic light scattering
Citation Formats
Miao, H., Zhang, T. T., Wang, L., Meyers, D., Said, A. H., Wang, Y. L., Shi, Y. G., Weng, H. M., Fang, Z., and Dean, M. P. M. Observation of Double Weyl Phonons in Parity-Breaking FeSi. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.121.035302.
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. Observation of Double Weyl Phonons in Parity-Breaking FeSi. United States. https://doi.org/10.1103/PhysRevLett.121.035302
Miao, H., Zhang, T. T., Wang, L., Meyers, D., Said, A. H., Wang, Y. L., Shi, Y. G., Weng, H. M., Fang, Z., and Dean, M. P. M. Wed .
"Observation of Double Weyl Phonons in Parity-Breaking FeSi". United States. https://doi.org/10.1103/PhysRevLett.121.035302. https://www.osti.gov/servlets/purl/1460696.
@article{osti_1460696,
title = {Observation of Double Weyl Phonons in Parity-Breaking FeSi},
author = {Miao, H. and Zhang, T. T. and Wang, L. and Meyers, D. and Said, A. H. and Wang, Y. L. and Shi, Y. G. and Weng, H. M. and Fang, Z. and Dean, M. P. M.},
abstractNote = {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)], we directly measure 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 nontrivial properties.},
doi = {10.1103/PhysRevLett.121.035302},
journal = {Physical Review Letters},
number = 3,
volume = 121,
place = {United States},
year = {Wed Jul 18 00:00:00 EDT 2018},
month = {Wed Jul 18 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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