Topological semimetal to insulator quantum phase transition in the Zintl compounds Ba[subscript 2]X(X = Si,Ge)
Name
PhysRevB.94.155121.pdf
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805.82 KB
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Checksum (MD5)
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Author(s)
Zhu, Ziming
Li, Mingda
Li, Ju
Alternative Title
Topological semimetal to insulator quantum phase transition in the Zintl compounds Ba2X(X = Si,Ge)
Date Issued
October 2016
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zhu, Ziming, Mingda Li, and Ju Li. “Topological Semimetal to Insulator Quantum Phase Transition in the Zintl Compounds B a 2 X ( X = Si , Ge ).” Physical Review B 94.15 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
By first-principles calculations, we find that Ba[subscript 2]X(X=Si,Ge) hosts a topological semimetal phase with one nodal ring in the k[subscript x]=0 plane, which is protected by the glide mirror symmetry when spin-orbit coupling (SOC) is ignored. The corresponding drumheadlike surface flat band appears on the (100) surface in surface Green's function calculation. Furthermore, a topological-semimetal-to-insulator transition is found. The nodal line semimetal would evolve into a topological insulator as SOC is turned on. The topologically protected metallic surface states emerge around the [bar over]Γ point, which could be tuned into the topologically trivial insulator state by more than 3% hydrostatic strain. These results reveal a category of materials showing quantum phase transition between topological semimetal and insulator, and tunability through elastic strain engineering.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.94.155121
