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Title: Phononic Helical Nodal Lines with PT Protection in MoB 2

Abstract

While condensed matter systems host both fermionic and bosonic quasiparticles, reliably predicting and empirically verifying topological states is only mature for Fermionic electronic structures, leaving topological Bosonic excitations sporadically explored. This is unfortunate, as Bosonic systems such as phonons offer the opportunity to assess spinless band structures where nodal lines can be realized without invoking special additional symetries to protect against spin-orbit coupling. Here we combine first-principles calculations and meV-resolution inelastic x-ray scattering to demonstrate the first realization of parity-time reversal symmetry protected helical nodal lines in the phonon spectrum of MoB2. This structure is unique to phononic systems as the spin-orbit coupling present in electronic systems tends to lift the degeneracy away from high-symmetry locations. Our study establishes a protocol to accurately identify topological Bosonic excitations, opening a new route to explore exotic topological states in crystalline materials.

Authors:
 [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [5];  [5];  [6];  [3];  [7];  [7]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Tokyo Inst. of Technology, Tokyo (Japan); Tokyo Inst. of Technology, Kanagawa (Japan)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Renmin Univ. of China, Beijing (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Chinese Academy of Sciences, Beijing (China); ShanghaiTech Univ., Shanghai (China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. ShanghaiTech Univ., Shanghai (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China); Songshan Lake Materials Lab., Guangdong (China)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities
OSTI Identifier:
1581515
Alternate Identifier(s):
OSTI ID: 1607466
Report Number(s):
BNL-212501-2020-JAAM
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US2101083
Grant/Contract Number:  
SC0012704; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 24; 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

Citation Formats

Zhang, T. T., Miao, H., Wang, Q., Lin, J. Q., Cao, Y., Fabbris, G., Said, A. H., Liu, X., Lei, H. C., Fang, Z., Weng, H. M., and Dean, Mark P. M. Phononic Helical Nodal Lines with PT Protection in MoB2. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.245302.
Zhang, T. T., Miao, H., Wang, Q., Lin, J. Q., Cao, Y., Fabbris, G., Said, A. H., Liu, X., Lei, H. C., Fang, Z., Weng, H. M., & Dean, Mark P. M. Phononic Helical Nodal Lines with PT Protection in MoB2. United States. doi:https://doi.org/10.1103/PhysRevLett.123.245302
Zhang, T. T., Miao, H., Wang, Q., Lin, J. Q., Cao, Y., Fabbris, G., Said, A. H., Liu, X., Lei, H. C., Fang, Z., Weng, H. M., and Dean, Mark P. M. Fri . "Phononic Helical Nodal Lines with PT Protection in MoB2". United States. doi:https://doi.org/10.1103/PhysRevLett.123.245302. https://www.osti.gov/servlets/purl/1581515.
@article{osti_1581515,
title = {Phononic Helical Nodal Lines with PT Protection in MoB2},
author = {Zhang, T. T. and Miao, H. and Wang, Q. and Lin, J. Q. and Cao, Y. and Fabbris, G. and Said, A. H. and Liu, X. and Lei, H. C. and Fang, Z. and Weng, H. M. and Dean, Mark P. M.},
abstractNote = {While condensed matter systems host both fermionic and bosonic quasiparticles, reliably predicting and empirically verifying topological states is only mature for Fermionic electronic structures, leaving topological Bosonic excitations sporadically explored. This is unfortunate, as Bosonic systems such as phonons offer the opportunity to assess spinless band structures where nodal lines can be realized without invoking special additional symetries to protect against spin-orbit coupling. Here we combine first-principles calculations and meV-resolution inelastic x-ray scattering to demonstrate the first realization of parity-time reversal symmetry protected helical nodal lines in the phonon spectrum of MoB2. This structure is unique to phononic systems as the spin-orbit coupling present in electronic systems tends to lift the degeneracy away from high-symmetry locations. Our study establishes a protocol to accurately identify topological Bosonic excitations, opening a new route to explore exotic topological states in crystalline materials.},
doi = {10.1103/PhysRevLett.123.245302},
journal = {Physical Review Letters},
number = 24,
volume = 123,
place = {United States},
year = {2019},
month = {12}
}

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