Fig. 4: Comparison of electron-phonon coupling between SrAl4 and BaAl4.
From: Origin of charge density wave in topological semimetals SrAl4 and EuAl4
Calculated phonon a lifetime γq and b dispersion ω for the transverse acoustic mode along the Γ-Z direction with different smearing in Ry for SrAl4 (solid lines) and BaAl4 (dashed lines). c, d Phonon band dispersion decorated with the mode-resolved electron-phonon coupling (EPC) strength (λq) in green shadow for SrAl4 and BaAl4, respectively, with the electronic smearing of 0.04 Ry. e Eigenvectors of the four zone-centered phonon modes with sizable λq from low to high frequency as shown in c, d. The atomic displacements are indicated by red arrows and the corresponding irreducible representations of Eu, Eg, B1g and A1g are labeled.
