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Fig. 6. Evolution of the wannier charge center of Si2Bi2 under the x-axis uniaxial compressive strain of −2.75 % at (a) k1=0.0, Z2=1; (b) k1=0.5, Z2=0; (c) k2=0.0, Z2=1; (d) k2=0.5, Z2=0; (e) k3=0.0, Z2=1; and (f) k3=0.5, Z2=0l. k1, k2, and k3 indicate crystal momenta in the corresponding reciprocal lattice. With these results, the Z2 value of Si2Bi2 was verified to be 1.
New Phys.: Sae Mulli 2021;71:218~224