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  • Title: Coherent structural dynamics of a prototypical charge-density-wave-to-metal transition.
    Author: Huber T, Mariager SO, Ferrer A, Schäfer H, Johnson JA, Grübel S, Lübcke A, Huber L, Kubacka T, Dornes C, Laulhe C, Ravy S, Ingold G, Beaud P, Demsar J, Johnson SL.
    Journal: Phys Rev Lett; 2014 Jul 11; 113(2):026401. PubMed ID: 25062214.
    Abstract:
    Using femtosecond time-resolved x-ray diffraction, we directly monitor the coherent lattice dynamics through an ultrafast charge-density-wave-to-metal transition in the prototypical Peierls system K(0.3)MoO(3) over a wide range of relevant excitation fluences. While in the low fluence regime we directly follow the structural dynamics associated with the collective amplitude mode; for fluences above the melting threshold of the electronic density modulation we observe a transient recovery of the periodic lattice distortion. We can describe these structural dynamics as a motion along the coordinate of the Peierls distortion triggered by the prompt collapse of electronic order after photoexcitation. The results indicate that the dynamics of a structural symmetry-breaking transition are determined by a high-symmetry excited state potential energy surface distinct from that of the initial low-temperature state.
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