Fig. 1: Energy band diagrams calculated using GGA.

a Sb₂Te₃ without SOC; b GST-147 without SOC; c GST-124 without SOC; d GST-225 without SOC; e GST-326 without SOC; f GeTe without SOC; g Sb₂Te₃ with SOC; h GST-147 with SOC; i GST-124 with SOC; j GST-225 with SOC; k GST-326 with SOC; l GeTe with SOC.