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We investigate experimentally both the amplitude and phase channels of thecollective modes in the quasi-1D charge-density-wave (CDW) system, K0.3MoO3, bycombining (i) optical impulsive-Raman pump-probe and (ii) terahertz time-domainspectroscopy (THz-TDS), with high resolution and a detailed analysis of thefull complex-valued spectra in both cases. This allows an unequivocalassignment of the observed bands to CDW modes across the THz range up to 9 THz.We revise and extend a time-dependent Ginzburg-Landau model to account for theobserved temperature dependence of the modes, where the combination of bothamplitude and phase modes allows one to robustly determine the bare-phonon andelectron-phonon coupling parameters. While the coupling is indeed strongest forthe lowest-energy phonon, dropping sharply for the immediately subsequentphonons, it grows back significantly for the higher-energy phonons,demonstrating their important role in driving the CDW formation. We alsoinclude a reassessment of our previous analysis of the lowest-lying phasemodes, whereby assuming weaker electronic damping for the phase channel resultsin a qualitative picture more consistent with quantum-mechanical treatments ofthe collective modes, with a strongly coupled amplitudon and phason as thelowest modes.

Combined investigation of collective amplitude and phase modes in a quasi-one-dimensional charge-density-wave system over a wide spectral range