Fig. 5: Softening of phonon velocity at the critical point. | Communications Physics

Fig. 5: Softening of phonon velocity at the critical point.

From: Emergent \({{{{{{{\mathcal{PT}}}}}}}}\)-symmetry breaking of collective modes with topological critical phenomena

Fig. 5

Numerically evaluated a expansion coefficients Ja,b,c and b phonon velocity υp as functions of the spin-orbit coupling (SOC) strength tso. Here we fix the interaction strength U/ε = 4, hopping coefficient ts/ε = 1 and occupation coefficient ν = 1/4.

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