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Amplitude dynamics of the charge density wave in LaTe3: theoretical description of pump-probe experiments

We formulate a dynamical model to describe a photoinduced charge density wave (CDW) quench transition and apply it to recent multiprobe experiments on LaTe3 [A. Zong et al., Nat. Phys. 15, 27 (2019)]. Our approach relies on coupled time-dependent Ginzburg-Landau equations tracking two order paramete...

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Bibliographic Details
Main Authors: Dolgirev, Pavel (Author) , Rozhkov, A. V. (Author) , Zong, Alfred (Author) , Kogar, Anshul (Author) , Gedik, Nuh (Author) , Fine, Boris V. (Author)
Format: Article (Journal)
Language:English
Published: 12 February 2020
In: Physical review
Year: 2020, Volume: 101, Issue: 5
ISSN:2469-9969
DOI:10.1103/PhysRevB.101.054203
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.101.054203
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.101.054203
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Author Notes:Pavel E. Dolgirev, A. V. Rozhkov, Alfred Zong, Anshul Kogar, Nuh Gedik, and Boris V. Fine
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Summary:We formulate a dynamical model to describe a photoinduced charge density wave (CDW) quench transition and apply it to recent multiprobe experiments on LaTe3 [A. Zong et al., Nat. Phys. 15, 27 (2019)]. Our approach relies on coupled time-dependent Ginzburg-Landau equations tracking two order parameters that represent the modulations of the electronic density and the ionic positions. We aim at describing the amplitude of the order parameters under the assumption that they are homogeneous in space. This description is supplemented by a three-temperature model, which treats separately the electronic temperature, temperature of the lattice phonons with stronger couplings to the electronic subsystem, and temperature of all other phonons. The broad scope of available data for LaTe3 and similar materials as well as the synergy between different time-resolved spectroscopies allow us to extract model parameters. The resulting calculations are in good agreement with ultrafast electron diffraction experiments, reproducing qualitative and quantitative features of the CDW amplitude evolution during the initial few picoseconds after photoexcitation.
Item Description:Im Titel ist 3 in LaTe3 tiefgestellt
Gesehen am 30.03.2020
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.101.054203

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