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Topological Semimetal-Insulator Quantum Phase Transition in Zintl Compounds Ba2X (X=Si, Ge) | | Ziming Zhu
; Mingda Li
; Ju Li
; | | Date: |
17 Oct 2016 | | Abstract: | By first-principles calculations, we find that Ba2X(X=Si, Ge) hosts a
topological semimetal phase with one nodal ring in the kx=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 function calculation. Furthermore, a
topological-semimetal-to-insulator transition (TSMIT) is found. The nodal line
semimetal would evolve into topological insulator as SOC is turned on. The
topologically protected metallic surface states emerge around the Gamma=0
point, which could be tuned into topologically-trivial insulator state by more
than 3% hydrostatic strain. These results reveal a new category of materials
showing quantum phase transition between topological semimetal and insulator,
and tunability through elastic strain engineering. | | Source: | arXiv, 1610.5128 | | Services: | Forum | Review | PDF | Favorites | |
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