| Disentanglement of the order parameter in the charge density wave state of blue bronze Talk Abstract: Recently it has been shown that the charge density wave (CDW) state can be non thermally melted with an optical laser pulse. (PRL 102, 066404) Interestingly the energy needed to melt the electronical modulation is approximately of the same order as the energy gain of the condensate which is in strong contrast to the experiments, that have been done on superconductors, where this energy amount is much higher. (PRL 91, 267002) (PRL 101,0227001) This gave rise to the idea, that electronic and lattice order are decoupled on the ultrashort time scales. Based on high resolution pump-probe spectroscopy data we developed a simple time dependent Ginzburg-Landau model, which enabled us to explain nearly all measured features. (PRL 105, 066402) For the first time it has been shown, that a nonadibatic coupling of electronic and lattice order is likely to be present in the CDW material blue bronze, which explains the long standing dilemma, why no real soft mode behavior has ever been observed in this material. (PRB 43, 8421-8430) |
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