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Title: Pseudo Dirac nodal sphere semimetal

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [1];  [5];  [6];  [1]
  1. Beijing Computational Science Research Center (China)
  2. Tsinghua Univ., Beijing (China)
  3. Univ. of Utah, Salt Lake City, UT (United States)
  4. Tsinghua Univ., Beijing (China); Beijing Computational Science Research Center (China)
  5. Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  6. 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
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (7)

Robust topological nodal lines in halide carbides journal January 2019
Topological nodal lines and hybrid Weyl nodes in YCoC 2 journal October 2019
A 2D nonsymmorphic Dirac semimetal in a chemically modified group-VA monolayer with a black phosphorene structure journal January 2019
Weyl nodes and magnetostructural instability in antiperovskite Mn 3 ZnC journal December 2019
Coulomb-induced instabilities of nodal surfaces 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