Fig. 4: Strain-induced Kramers Weyl fermions.
a Schematic plot of a KNL (solid line) carrying Berry flux π. b The Berry flux emerges from TRIMs when the degeneracy of the KNL is lifted. The total flux through a sphere (in green) that enclose the TRIM is 2π. c–e The splitting along Γ–A with 1%, 3%, and 5% strain strengths, respectively. f The chiral charge \({\mathcal{C}}\) versus light frequency ω, calculated at four different strain strengths: no strain (in black), 1% strain (in blue), 3% strain (in red), and 5% strain (in purple).
