Fig. 2
From: Prediction of a topological p + ip excitonic insulator with parity anomaly
The mapping of \(\hat d({\bf{k}})\). a The mapping in the original spin basis. b The mapping in the chiral basis. The difference between the two situations shows that the two topological invariants are needed to completely characterize the p + ip excitonic insulator, i.e., (C, Cc) = (0, 1/2)
