A dynamical stability limit for the charge density wave in K0.3MoO3

Mankowsky, R.; Liu, Biaolong; Rajasekaran, S.; Liu, Haiyun; Mou, D.; Zhou, X. J.; Merlin, R.; Foerst, M.; Cavalleri, A.

doi:10.1103/PhysRevLett.118.116402

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A dynamical stability limit for the charge density wave in K0.3MoO3

MPS-Authors

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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;

/persons/resource/persons172950

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;

/persons/resource/persons133811

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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https://arxiv.org/abs/1702.05897
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https://dx.doi.org/10.1103/PhysRevLett.118.116402
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1702.05897.pdf
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mankowsky-PhyRL-118-116402-2017.pdf
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Citation

Mankowsky, R., Liu, B., Rajasekaran, S., Liu, H., Mou, D., Zhou, X. J., et al. (2017). A dynamical stability limit for the charge density wave in K0.3MoO3. Physical Review Letters, 118: 116402. doi:10.1103/PhysRevLett.118.116402.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-8013-D

Abstract

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.