Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction
Abstract
Cadmium arsenide (Cd3As2) is one of the first materials to be discovered to belong to the class of three-dimensional topological semimetals. Reported room-temperature crystal structures of Cd3As2 differ subtly in the way the Cd vacancies are arranged within its antifluorite-derived structure, which determines if an inversion center is present and if Cd3As2 is a Dirac or Weyl semimetal. Here, we apply convergent beam electron diffraction (CBED) to determine the point group of Cd3As2 thin films grown by molecular-beam epitaxy. Using CBED patterns from multiple zone axes, high-angle annular dark-field images acquired in scanning transmission electron microscopy, and Bloch wave simulations, we show that Cd3As2 belongs to the tetragonal 4/mmm point group, which is centrosymmetric. In conclusion, the results show that CBED can distinguish very subtle differences in the crystal structure of a topological semimetal, a capability that will be useful for designing materials and thin film heterostructures with topological states that depend on the presence of certain crystal symmetries.
- Authors:
-
- Univ. of California, Santa Barbara, CA (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.
- Publication Date:
- Research Org.:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOD; National Science Foundation (NSF)
- OSTI Identifier:
- 1593379
- Alternate Identifier(s):
- OSTI ID: 1558162
- Grant/Contract Number:
- FG02-02ER45994; N00014-16-1-2814
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Kim, Honggyu, Goyal, Manik, Salmani-Rezaie, Salva, Schumann, Timo, Pardue, Tyler N., Zuo, Jian-Min, and Stemmer, Susanne. Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.084202.
Kim, Honggyu, Goyal, Manik, Salmani-Rezaie, Salva, Schumann, Timo, Pardue, Tyler N., Zuo, Jian-Min, & Stemmer, Susanne. Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction. United States. doi:10.1103/PhysRevMaterials.3.084202.
Kim, Honggyu, Goyal, Manik, Salmani-Rezaie, Salva, Schumann, Timo, Pardue, Tyler N., Zuo, Jian-Min, and Stemmer, Susanne. Tue .
"Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction". United States. doi:10.1103/PhysRevMaterials.3.084202. https://www.osti.gov/servlets/purl/1593379.
@article{osti_1593379,
title = {Point group symmetry of cadmium arsenide thin films determined by convergent beam electron diffraction},
author = {Kim, Honggyu and Goyal, Manik and Salmani-Rezaie, Salva and Schumann, Timo and Pardue, Tyler N. and Zuo, Jian-Min and Stemmer, Susanne},
abstractNote = {Cadmium arsenide (Cd3As2) is one of the first materials to be discovered to belong to the class of three-dimensional topological semimetals. Reported room-temperature crystal structures of Cd3As2 differ subtly in the way the Cd vacancies are arranged within its antifluorite-derived structure, which determines if an inversion center is present and if Cd3As2 is a Dirac or Weyl semimetal. Here, we apply convergent beam electron diffraction (CBED) to determine the point group of Cd3As2 thin films grown by molecular-beam epitaxy. Using CBED patterns from multiple zone axes, high-angle annular dark-field images acquired in scanning transmission electron microscopy, and Bloch wave simulations, we show that Cd3As2 belongs to the tetragonal 4/mmm point group, which is centrosymmetric. In conclusion, the results show that CBED can distinguish very subtle differences in the crystal structure of a topological semimetal, a capability that will be useful for designing materials and thin film heterostructures with topological states that depend on the presence of certain crystal symmetries.},
doi = {10.1103/PhysRevMaterials.3.084202},
journal = {Physical Review Materials},
number = 8,
volume = 3,
place = {United States},
year = {2019},
month = {8}
}
Web of Science
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