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11 juin 2020: 1 événement

séminaire

  • (Online) Charge Order in Real Materials

    Jeudi 11 juin 10:00-11:00 - Jasper van Wezel, Institute for Theoretical Physics, University of Amsterdam - Institute for Theoretical Physics, University of Amsterdam

    (Online) Charge Order in Real Materials

    Résumé : The prototype model for charge order is the Peierls instability in a one-dimensional, monatomic, monovalent, and uniformly spaced chain of atoms. The charge order in that highly artificial setting is unavoidable and easy to understand, leading it to be commonly used as a model for charge order in real materials, despite the fact that it has been repeatedly shown to be severely oversimplified.
    I will show that by applying some techniques borrowed from quantum field theory, it is possible to quantitatively model charge order in real materials, and in particular in (correlated) 2D materials. This approach brings to the fore the all-important role of the structure of electron-phonon coupling in determining many of the properties of the charge ordered state. I will show that it can be used to understand a range of seemingly mysterious results in the literature surrounding charge ordered transition-metal dichalcogenides, and argue that it is widely applicable to charge ordered materials in correlated 2D materials in general.
    [1] F. Flicker and J. van Wezel, PRB 94, 235135 (2016) ; Nat. Comm. 6, 7034 (2015).
    [2] A. Kogar et al., Science 358, 1314 (2017).
    [3] A. Silva and J. van Wezel, SciPost Phys. 4, 028 (2018).
    [4] A. Silva, J. Henke, and J. van Wezel, PRB 97, 045151 (2018).
    [5] S. Gao et al., PNAS 115, 6986 (2018).
    [6] A. Wieteska et al., arXiv:1903.05253 (2019).
    [7] J. Henke, F. Flicker, J. Laverock and J. van Wezel, arXiv:1911.11112 (2019).

    Lieu : ONLINE

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