Pseudo Dirac nodal sphere semimetal
- Beijing Computational Science Research Center (China)
- Tsinghua Univ., Beijing (China)
- Univ. of Utah, Salt Lake City, UT (United States)
- Tsinghua Univ., Beijing (China); Beijing Computational Science Research Center (China)
- Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Topological semimetals (TSMs) in which conduction and valence bands cross at zero-dimensional (0D) Dirac nodal points (DNPs) or 1D Dirac nodal lines (DNLs), in 3D momentum space, have recently drawn much attention due to their exotic electronic properties. Here, we generalize the TSM state further to a higher-dimensional Dirac nodal sphere (DNS) or pseudo DNS (PDNS) state, with the band crossings forming a 2D closed or approximate sphere at the Fermi level. This TSM state can exhibit unique electronic properties, making DNS/PDNS a type of fermion beyond the DNP/DNL paradigm. In realistic crystals, we demonstrate two possible types of PDNS states underlain by different crystalline symmetries, which are characterized with a spherical backbone consisting of multiple DNLs and approximate band degeneracy in between the DNLs. Here, we identify all the possible band crossings with pairs of 1D irreducible representations to form the PDNS states in 32 point groups. Importantly, we discover that strained MH3 ( M = Y , Ho, Tb, Nd) and Si3N2 are material candidates to realize these two types of PDNS states, respectively. As a high-symmetry-required state, the PDNS semimetal can be regarded as the “parent phase” for other topological gapped and gapless states.
- Research Organization:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); NSFC
- Grant/Contract Number:
- FG02-04ER46148; 11574024; 2016YFA0301001; 11674188; 11334006
- OSTI ID:
- 1609550
- Alternate ID(s):
- OSTI ID: 1492139
- Journal Information:
- Physical Review B, Vol. 98, Issue 20; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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A 2D nonsymmorphic Dirac semimetal in a chemically modified group-VA monolayer with a black phosphorene structure
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Weyl nodes and magnetostructural instability in antiperovskite Mn 3 ZnC
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journal | December 2019 |
Coulomb-induced instabilities of nodal surfaces
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journal | December 2018 |
Coulomb-induced instabilities of nodal surfaces | text | January 2018 |
Topological nodal lines and hybrid Weyl nodes in YCoC$_2$ | text | January 2019 |
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