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Title: 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)], 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.

Authors:
 [1];  [2];  [2];  [1];  [3];  [1];  [4];  [5];  [5];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  2. 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)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  4. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics
  5. 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 Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); 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. 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., and Dean, M. P. M. Wed . "Observation of Double Weyl Phonons in Parity-Breaking FeSi". United States. doi: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)], 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.},
doi = {10.1103/PhysRevLett.121.035302},
journal = {Physical Review Letters},
number = 3,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}

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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: Two types of double-Weyl points are predicted in FeSi [18]. (a) and (b) show the cubic unit cell and the Brillouin zone (BZ) of FeSi, respectively. The purple (101) plane corresponds to the exposed sample surface in our measurement. The high symmetry points in the 3D BZ andmore » the projected 2D BZ are shown in black and light-blue, respectively. (c) and (d) show the schematic 3D view of the spin-1 Weyl point and charge-2 Dirac point, respectively. Their corresponding 2D view projections and Chern numbers are shown in (e) and (f), respectively.« less

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