Pseudo Dirac nodal sphere semimetal
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); NSFC
- OSTI Identifier:
- 1609550
- Alternate Identifier(s):
- OSTI ID: 1492139
- Grant/Contract Number:
- FG02-04ER46148; 11574024; 2016YFA0301001; 11674188; 11334006
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 20; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics; first-principles calculations; topological materials; topological phases of matter
Citation Formats
Wang, Jianfeng, Liu, Yizhou, Jin, Kyung-Hwan, Sui, Xuelei, Zhang, Lizhi, Duan, Wenhui, Liu, Feng, and Huang, Bing. Pseudo Dirac nodal sphere semimetal. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.201112.
Wang, Jianfeng, Liu, Yizhou, Jin, Kyung-Hwan, Sui, Xuelei, Zhang, Lizhi, Duan, Wenhui, Liu, Feng, & Huang, Bing. Pseudo Dirac nodal sphere semimetal. United States. https://doi.org/10.1103/physrevb.98.201112
Wang, Jianfeng, Liu, Yizhou, Jin, Kyung-Hwan, Sui, Xuelei, Zhang, Lizhi, Duan, Wenhui, Liu, Feng, and Huang, Bing. Mon .
"Pseudo Dirac nodal sphere semimetal". United States. https://doi.org/10.1103/physrevb.98.201112. https://www.osti.gov/servlets/purl/1609550.
@article{osti_1609550,
title = {Pseudo Dirac nodal sphere semimetal},
author = {Wang, Jianfeng and Liu, Yizhou and Jin, Kyung-Hwan and Sui, Xuelei and Zhang, Lizhi and Duan, Wenhui and Liu, Feng and Huang, Bing},
abstractNote = {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.},
doi = {10.1103/physrevb.98.201112},
journal = {Physical Review B},
number = 20,
volume = 98,
place = {United States},
year = {Mon Nov 26 00:00:00 EST 2018},
month = {Mon Nov 26 00:00:00 EST 2018}
}
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