Coherent amplitudon generation in K_0.3MoO_3 through ultrafast inter-band quasi particle decay

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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Scientific paper

10.1088/0953-8984/19/34/346208

The charge density wave system K_0.3MoO_3 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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