Table 2 Calculated topological invariant Z2 for the stable structural phases of MX2, MX2H, and MXY

From: Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

 

V

Nb

Ta

Tc

Re

X2

M

M

M

M

M

X2H

0

0

0

Refer to Table 4

 

MXYhal

0

0

0

  

MXYpnic

Refer to Table 3

0

0

  1. Z2 = 0 indicates the trivial phase, whereas Z2 = 1 is for the nontrivial phase. Z2 invariant is not applicable to a metal, and for this reason, metallic systems are denoted by M
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