Comments (2)
For the Z2 invariant, the chosen surface should only cover half the Brillouin zone (between two time-reversal invariant lines).
If it covers the whole Brillouin zone (as with lambda s,t2: [s, t2, 0]
), it effectively calculates twice the Z2 invariant. Because it's only defined modulo 2, that will always be zero.
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So I use "surface = lambda s,t2: [s/2, t2, 0] " to calculate the Z2 invariant which is correct because it covers the half of Brillouin zone? Thank you for your help!
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