Realization of a Type-II Nodal-Line Semimetal in Mg3Bi2
Abstract
Nodal-line semimetals (NLSs) represent a new type of topological semimetallic phase beyond Weyl and Dirac semimetals in the sense that they host closed loops or open curves of band degeneracies in the Brillouin zone. Parallel to the classification of type-I and type-II Weyl semimetals, there are two types of NLSs. The type-I NLS phase has been proposed and realized in many compounds, whereas the exotic type-II NLS phase that strongly violates Lorentz symmetry has remained elusive. First-principles calculations show that Mg3Bi2 is a material candidate for the type-II NLS. The band crossing is close to the Fermi level and exhibits the type-II nature of the nodal line in this material. Spin–orbit coupling generates only a small energy gap (≈35 meV) at the nodal points and does not negate the band dispersion of Mg3Bi2 that yields the type-II nodal line. Based on this prediction, Mg3Bi2 single crystals are synthesized and the presence of the type-II nodal lines in the material is confirmed. The angle-resolved photoemission spectroscopy measurements agree well with the first-principles results below the Fermi level and thus strongly suggest Mg3Bi2 as an ideal material platform for studying the as-yet unstudied properties of type-II nodal-line semimetals.
- Authors:
-
[1];
- National Cheng Kung Univ., Tainan City (Taiwan). Dept. of Physics
- Princeton Univ., NJ (United States). Dept. of Physics
- Princeton Univ., NJ (United States). Dept. of Chemistry
- Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and AstronomyA
- National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Connecticut, Storrs, CT (United States). Dept. of Physics
- National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics; Academia Sinica, Taipei (Taiwan). Inst. of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1581061
- Alternate Identifier(s):
- OSTI ID: 1488843
- Report Number(s):
- BNL-209819-2018-JAAM
Journal ID: ISSN 2198-3844; ark:/13030/qt0396641v; TRN: US2101980
- Grant/Contract Number:
- AC02-05CH11231; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Science
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2198-3844
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DFT calculations; ARPES; topological materials; topological semimetal; Mg3Bi2
Citation Formats
Chang, Tay-Rong, Pletikosic, Ivo, Kong, Tai, Bian, Guang, Huang, Angus, Denlinger, Jonathan, Kushwaha, Satya K., Sinkovic, Boris, Jeng, Horny-Tay, Valla, Tonica, Xie, Weiwei, and Cava, Robert J. Realization of a Type-II Nodal-Line Semimetal in Mg3Bi2. United States: N. p., 2018.
Web. doi:10.1002/advs.201800897.
Chang, Tay-Rong, Pletikosic, Ivo, Kong, Tai, Bian, Guang, Huang, Angus, Denlinger, Jonathan, Kushwaha, Satya K., Sinkovic, Boris, Jeng, Horny-Tay, Valla, Tonica, Xie, Weiwei, & Cava, Robert J. Realization of a Type-II Nodal-Line Semimetal in Mg3Bi2. United States. https://doi.org/10.1002/advs.201800897
Chang, Tay-Rong, Pletikosic, Ivo, Kong, Tai, Bian, Guang, Huang, Angus, Denlinger, Jonathan, Kushwaha, Satya K., Sinkovic, Boris, Jeng, Horny-Tay, Valla, Tonica, Xie, Weiwei, and Cava, Robert J. Wed .
"Realization of a Type-II Nodal-Line Semimetal in Mg3Bi2". United States. https://doi.org/10.1002/advs.201800897. https://www.osti.gov/servlets/purl/1581061.
@article{osti_1581061,
title = {Realization of a Type-II Nodal-Line Semimetal in Mg3Bi2},
author = {Chang, Tay-Rong and Pletikosic, Ivo and Kong, Tai and Bian, Guang and Huang, Angus and Denlinger, Jonathan and Kushwaha, Satya K. and Sinkovic, Boris and Jeng, Horny-Tay and Valla, Tonica and Xie, Weiwei and Cava, Robert J.},
abstractNote = {Nodal-line semimetals (NLSs) represent a new type of topological semimetallic phase beyond Weyl and Dirac semimetals in the sense that they host closed loops or open curves of band degeneracies in the Brillouin zone. Parallel to the classification of type-I and type-II Weyl semimetals, there are two types of NLSs. The type-I NLS phase has been proposed and realized in many compounds, whereas the exotic type-II NLS phase that strongly violates Lorentz symmetry has remained elusive. First-principles calculations show that Mg3Bi2 is a material candidate for the type-II NLS. The band crossing is close to the Fermi level and exhibits the type-II nature of the nodal line in this material. Spin–orbit coupling generates only a small energy gap (≈35 meV) at the nodal points and does not negate the band dispersion of Mg3Bi2 that yields the type-II nodal line. Based on this prediction, Mg3Bi2 single crystals are synthesized and the presence of the type-II nodal lines in the material is confirmed. The angle-resolved photoemission spectroscopy measurements agree well with the first-principles results below the Fermi level and thus strongly suggest Mg3Bi2 as an ideal material platform for studying the as-yet unstudied properties of type-II nodal-line semimetals.},
doi = {10.1002/advs.201800897},
journal = {Advanced Science},
number = 4,
volume = 6,
place = {United States},
year = {Wed Nov 28 00:00:00 EST 2018},
month = {Wed Nov 28 00:00:00 EST 2018}
}
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Figures / Tables:
Figure 1.: Crystal structure and bulk bands of Mg3Bi2. a) The lattice structure of Mg3Bi2, the blue and orange balls indicate the Mg and Bi atoms, respectively. b) Powder X-ray diffraction (PXRD) pattern. The green arrows in the PXRD pattern correspond to the remaining Bi flux on the sample surface.more »
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