Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si, Ge, or Sn)
Abstract
Topological semimetals (TSMs) including Weyl semimetals and nodal-line semimetals are expected to open the next frontier of condensed matter and materials science. Although the first inversion breaking Weyl semimetal was recently discovered in TaAs, its magnetic counterparts, i.e., the time-reversal breaking Weyl and nodal line semimetals, remain elusive. They are predicted to exhibit exotic properties distinct from the inversion breaking TSMs including TaAs. In this paper, we identify the magnetic topological semimetal states in the ferromagnetic half-metal compounds Co2TiX (X = Si, Ge, or Sn) with Curie temperatures higher than 350 K. Our first-principles band structure calculations show that, in the absence of spin-orbit coupling, Co2TiX features three topological nodal lines. The inclusion of spin-orbit coupling gives rise to Weyl nodes, whose momentum space locations can be controlled as a function of the magnetization direction. Lastly, our results not only open the door for the experimental realization of topological semimetal states in magnetic materials at room temperature, but also suggest potential applications such as unusual anomalous Hall effect in engineered monolayers of the Co2TiX compounds at high temperature.
- Authors:
-
- National Univ. of Singapore (Singapore)
- Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1361395
- Grant/Contract Number:
- FG02-05ER46200
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 36 MATERIALS SCIENCE; electronic properties and materials; topological insulators
Citation Formats
Chang, Guoqing, Xu, Su -Yang, Zheng, Hao, Singh, Bahadur, Hsu, Chuang -Han, Bian, Guang, Alidoust, Nasser, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Songtian, Lin, Hsin, and Hasan, M. Zahid. Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si, Ge, or Sn). United States: N. p., 2016.
Web. doi:10.1038/srep38839.
Chang, Guoqing, Xu, Su -Yang, Zheng, Hao, Singh, Bahadur, Hsu, Chuang -Han, Bian, Guang, Alidoust, Nasser, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Songtian, Lin, Hsin, & Hasan, M. Zahid. Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si, Ge, or Sn). United States. https://doi.org/10.1038/srep38839
Chang, Guoqing, Xu, Su -Yang, Zheng, Hao, Singh, Bahadur, Hsu, Chuang -Han, Bian, Guang, Alidoust, Nasser, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Songtian, Lin, Hsin, and Hasan, M. Zahid. 2016.
"Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si, Ge, or Sn)". United States. https://doi.org/10.1038/srep38839. https://www.osti.gov/servlets/purl/1361395.
@article{osti_1361395,
title = {Room-temperature magnetic topological Weyl fermion and nodal line semimetal states in half-metallic Heusler Co2TiX (X=Si, Ge, or Sn)},
author = {Chang, Guoqing and Xu, Su -Yang and Zheng, Hao and Singh, Bahadur and Hsu, Chuang -Han and Bian, Guang and Alidoust, Nasser and Belopolski, Ilya and Sanchez, Daniel S. and Zhang, Songtian and Lin, Hsin and Hasan, M. Zahid},
abstractNote = {Topological semimetals (TSMs) including Weyl semimetals and nodal-line semimetals are expected to open the next frontier of condensed matter and materials science. Although the first inversion breaking Weyl semimetal was recently discovered in TaAs, its magnetic counterparts, i.e., the time-reversal breaking Weyl and nodal line semimetals, remain elusive. They are predicted to exhibit exotic properties distinct from the inversion breaking TSMs including TaAs. In this paper, we identify the magnetic topological semimetal states in the ferromagnetic half-metal compounds Co2TiX (X = Si, Ge, or Sn) with Curie temperatures higher than 350 K. Our first-principles band structure calculations show that, in the absence of spin-orbit coupling, Co2TiX features three topological nodal lines. The inclusion of spin-orbit coupling gives rise to Weyl nodes, whose momentum space locations can be controlled as a function of the magnetization direction. Lastly, our results not only open the door for the experimental realization of topological semimetal states in magnetic materials at room temperature, but also suggest potential applications such as unusual anomalous Hall effect in engineered monolayers of the Co2TiX compounds at high temperature.},
doi = {10.1038/srep38839},
url = {https://www.osti.gov/biblio/1361395},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 6,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2016},
month = {Thu Dec 15 00:00:00 EST 2016}
}
Web of Science
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