Table 1 Parameters of the TB model for the QTI with chiral symmetry when δ = 0.

From: Quadrupole topological insulators in Ta2M3Te5 (M = Ni, Pd) monolayers

εs

ts1

ts2

ts3

tsp

εp

tp1

tp2

tp3

2.05

−1

−0.8

−0.2

0.3

−2.05

1

0.8

0.2(1+δ)