Title: Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb₄

Abstract

Topological 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.

Authors:

Wu, Han ^[1]; Hallas, Alannah M.  ^[2];

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Cai, Xiaochan ^[3]; Huang, Jianwei ^[1]; Oh, Ji Seop ^[4]; Loganathan, Vaideesh ^[1]; Weiland, Ashley ^[5]; McCandless, Gregory T. ^[6]; Chan, Julia Y.  ^[6];

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Mo, Sung-Kwan  ^[7];

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Lu, Donghui  ^[8];

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Hashimoto, Makoto  ^[8];

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Denlinger, Jonathan  ^[7];

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Birgeneau, Robert J.  ^[9];

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Nevidomskyy, Andriy H.  ^[1];

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Li, Gang  ^[3];

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Morosan, Emilia ^[1]; Yi, Ming  ^[1]

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+ Show Author Affiliations

1. Rice Univ., Houston, TX (United States)
2. Rice Univ., Houston, TX (United States); Univ. of British Columbia, Vancouver, BC (Canada)
3. ShanghaiTech Univ. (China)
4. Univ. of California, Berkeley, CA (United States); Rice Univ., Houston, TX (United States)
5. Univ. of Texas at Dallas, Richardson, TX (United States)
6. Univ. of Texas at Dallas, Richardson, TX (United States); Baylor Univ., Waco, TX (United States)
7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
8. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
9. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:

Fri Mar 18 00:00:00 EDT 2022

Research Org.:

Rice Univ., Houston, TX (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS); National Science Foundation (NSF); Robert A. Welch Foundation; Betty Moore Foundation; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences; Natural Sciences and Engineering Research Council of Canada (NSERC); CIFAR Azrieli Global Scholars

OSTI Identifier:

2281374

Alternate Identifier(s):

OSTI ID: 1866796; OSTI ID: 1877047

Grant/Contract Number:  

SC0019503; AC02-05CH11231; AC02-76SF00515; SC0021421; SC0014664; C-2024; DMR-1921847; DMR-1921798; GBMF9470; 11874263; 2017YFE0131300; XDA18010000; DMR-1917511; C-1818; DMR-2209804

Resource Type:

Accepted Manuscript

Journal Name:

npj Quantum Materials

Additional Journal Information:

Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2397-4648

Publisher:

Nature Publishing Group

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 74 ATOMIC AND MOLECULAR PHYSICS; 36 MATERIALS SCIENCE; electronic properties and materials; topological insulators