Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb4
AbstractTopological semimetals with symmetry-protected band crossings have emerged as a rich landscape to explore intriguing electronic phenomena. Nonsymmorphic symmetries in particular have been shown to play an important role in protecting the crossings along a line (rather than a point) in moment...
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Published in | npj quantum materials Vol. 7; no. 1 |
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Main Authors | , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Nature Publishing Group
18.03.2022
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Subjects | |
Online Access | Get full text |
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Summary: | AbstractTopological semimetals with symmetry-protected band crossings have emerged as a rich landscape to explore intriguing electronic phenomena. Nonsymmorphic symmetries in particular have been shown to play an important role in protecting the crossings along a line (rather than a point) in momentum space. Here we report experimental and theoretical evidence for Dirac nodal line crossings along the Brillouin zone boundaries in PtPb4, arising from the nonsymmorphic symmetry of its crystal structure. Interestingly, while the nodal lines would remain gapless in the absence of spin–orbit coupling (SOC), the SOC, in this case, plays a detrimental role to topology by lifting the band degeneracy everywhere except at a set of isolated points. Nevertheless, the nodal line is observed to have a bandwidth much smaller than that found in density functional theory (DFT). Our findings reveal PtPb4 to be a material system with narrow crossings approximately protected by nonsymmorphic crystalline symmetries. |
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Bibliography: | Chinese Academy of Sciences Natural Sciences and Engineering Research Council of Canada (NSERC) USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS) USDOE Office of Science (SC), Basic Energy Sciences (BES) Betty Moore Foundation National Science Foundation (NSF) Robert A. Welch Foundation National Natural Science Foundation of China (NSFC) SC0019503; AC02-05CH11231; AC02-76SF00515; SC0021421; SC0014664; C-2024; DMR-1921847; DMR-1921798; GBMF9470; 11874263; 2017YFE0131300; XDA18010000; DMR-1917511; C-1818; DMR-2209804 CIFAR Azrieli Global Scholars |
ISSN: | 2397-4648 2397-4648 |