"Anharmonic order-parameter oscillations and lattice coupling in strongly driven 1T-TaS(2) and TbTe(3) charge-density-wave compounds: A multiple-pulse femtosecond laser spectroscopy study"

Kusar, P.: Mertelj, T.; Kabanov, V. V.; Chu, J.-H.; Fisher, I. R.; Berger, H.; Forró, L.; Mihailovic, D.; Physical Review B , 1/10/11.

Additional Authors: Mertelj, T.; Kabanov, V. V.; Chu, J.-H.; Fisher, I. R.; Berger, H.; Forró, L.; Mihailovic, D.

Abstract:

The anharmonic response of charge-density wave (CDW) order to strong laser-pulse perturbations in 1 T-TaS2 and TbTe3 is investigated by means of multiple-pump-pulse time-resolved femtosecond optical spectroscopy. We observe remarkable anharmonic effects hitherto undetected in systems exhibiting collective charge ordering. The efficiency for additional excitation of the amplitude mode by a laser pulse becomes periodically modulated after the mode is strongly excited into a coherently oscillating state. A similar effect is observed also for some other phonons, where the cross-modulation at the amplitude-mode frequency indicates anharmonic interaction of those phonons with the amplitude mode. By analyzing the observed phenomena in the framework of time-dependent Ginzburg-Landau theory we attribute the effects to the anharmonicity of the mode potentials inherent in the broken symmetry state of the CDW systems.