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Dynamical Stability Limit for the Charge Density Wave in K0.3MoO3

MPG-Autoren
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Mankowsky,  R.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Liu,  Biaolong
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Rajasekaran,  S.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Liu,  Haiyun
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Foerst,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Depa rtment of Physics, Oxford University, Clar endon Laboratory, Oxford , UK;

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Zitation

Mankowsky, R., Liu, B., Rajasekaran, S., Liu, H., Mou, D., Zhou, X. J., et al. (2017). Dynamical Stability Limit for the Charge Density Wave in K0.3MoO3. Physical Review Letters, 118: 116402. doi:10.1103/PhysRevLett.118.116402.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002C-8013-D
Zusammenfassung
We study the response of the one-dimensional charge density wave in K0.3MoO3 to different types of excitation with femtosecond optical pulses. We compare the response to direct excitation of the lattice at mid-infrared frequencies with that to the injection of quasi-particles across the low-energy charge density wave gap and to charge transfer excitations in the near infrared. For all three cases, we observe a fluence threshold above which the amplitude-mode oscillation frequency is softened and the mode becomes increasingly damped. We show that all the data can be collapsed onto a universal curve in which the melting of the charge density wave occurs abruptly at a critical lattice excursion. These data highlight the existence of a universal stability limit for a charge density wave, reminiscent of the empirical Lindemann criterion for the stability of a crystal lattice.