engleski

Single particle and collective excitations in the one-dimensional charge density wave solid K_0.3MoO_3 probed in real time by femtosecond spectroscopy

Ultrafast transient reflectivity changes caused by collective and single particle excitations in the quasi-one-dimensional charge-density wave (CDW) semiconductor K_0.3MoO_3 an investigated with optical pump-probe spectroscopy. The temperature dependence of nonequilibrium single particle excitations across the CDW gap and their recombination dynamics are reported for the first time. In addition, amplitude mode reflectivity oscillations are observed in real time. A T-dependent overdamped response is also observed which is attributed to relaxation of the phason mode.

charge-density-wave systems; ultrafast optical measurements in condensed matter; collective modes; low-dimensional conductors

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