Fig. 4: Lindhard response function and electron-phonon coupling strength.
From: Proposed hydrogen kagome metal with charge density wave state and enhanced superconductivity
a The imaginary and (b) real part of normalized Lindhard response function for the pristine phase in the xz plane at 30 GPa. c The real part of static bare susceptibility and (d) λq strength along high symmetry paths in the pristine structure at various pressures, which corresponds to three softened phonon modes becomes imaginary at 25 GPa, i. e. two lowest acoustic modes and one softened optical mode.
