Coherent amplitudon generation in K0.3MoO3 through ultrafast inter-band quasi particle decay
D. M. Sagar, A. A. Tsvetkov, D. Fausti, S. van Smaalen, P. H. M. van Loosdrecht
Abstract
The charge density wave system K0.3MoO3 has been studied using variable energy pump-probe spectroscopy, ellipsometry, and inelastic light scattering. The observed transient reflectivity response exhibits quite a complex behavior, containing contributions due to quasi particle excitations, coherent amplitudons and phonons, and heating effects. The generation of coherent amplitudons is discussed in terms of relaxation of photo-excited quasi particles, and is found to be resonant with the interband plasmon frequency. Two additional coherent excitations observed in the transients are assigned to zone-folding modes of the charge density wave state.
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