Fig. 4
From: Prediction of a topological p + ip excitonic insulator with parity anomaly
The results from mean-field calculations. a Condensation energy versus interaction V for p + ip excitonic insulator and polar excitonic insulator. b Calculated mean-field excitonic order parameter for p + ip excitonic insulator (Δc) and polar excitonic insulator (Δp) versus interaction V. \(\left| {{\mathrm{\Delta }}_{{\mathrm{c/p}}}} \right|^2{\mathrm{/}}v_{\mathrm{F}}^2{\mathrm{\Lambda }}^2 \ll 1\) is assumed. c The phase diagram based on unbiased mean-field with considering both the s- and p + ip-wave interaction channel. The dash-dotted red line denotes the Hubbard interaction case with Vs = Vp
