Dear all, As you know one can determine the Z2 topological invariant by using the parity of filled wave function. I performed such a calculation for stanene (Tin 2D structure) and other structure. For stanene some parities are "?" so I decide to check for other structures with strong spin-orbit interaction. I check 3 different structures and find that the QE give Z2 invariant +1 (topological phase) with and without spin-orbit coupling. There is no band inversion in TRIM points but the Z2 invariant is 1, even without considering spin-orbit interaction. In most of works people used VASP for parities, did any one try Z2 invariant with QE? Any suggestion appreciated.
Best, -- Mohsen Modarresi, PhD student of Solid State Physics, Ferdowsi University of Mashhad, Iran. Phone +98-9133452131
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