Počet záznamů: 1  

Subterahertz collective dynamics of polar vortices

  1. 1.
    0542867 - FZÚ 2022 RIV GB eng J - Článek v odborném periodiku
    Li, Q. - Stoica, V.A. - Pasciak, Marek - Zhu, Y. - Yuan, Y. - Yang, T.N. - McCarter, M.R. - Das, S. - Yadav, A.K. - Park, S. - Dai, C. - Lee, H. J. - Ahn, Y. - Marks, S.D. - Yu, S.K. - Kadlec, Christelle - Sato, T. - Hoffmann, M.C. - Chollet, M. - Kozina, M.E. - Nelson, S. - Zhu, D. - Walko, D.A. - Lindenberg, A.M. - Evans, P.G. - Chen, L.Q. - Ramesh, R. - Martin, L.W. - Gopalan, V. - Freeland, J.W. - Hlinka, Jiří - Wen, H.
    Subterahertz collective dynamics of polar vortices.
    Nature. Roč. 592, č. 7854 (2021), s. 376-380. ISSN 0028-0836. E-ISSN 1476-4687
    Grant CEP: GA ČR GX19-28594X
    Výzkumná infrastruktura: CESNET II - 90042
    Institucionální podpora: RVO:68378271
    Klíčová slova: topological defects * skyrmions * polar skyrmions * ferroelectricity skyrmions
    Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
    Impakt faktor: 69.504, rok: 2021
    Způsob publikování: Omezený přístup
    https://doi.org/10.1038/s41586-021-03342-4

    Using terahertz-field excitation and femtosecond X-ray diffraction measurements, we observe ultrafast collective polarization dynamics that are unique to polar vortices earlier shown to have topology of 2D skyrmions. A previously unseen tunable mode, hereafter referred to as a vortexon, emerges in the form of transient arrays of nanoscale circular patterns of atomic displacements. Its frequency is considerably reduced (softened) at a critical strain, indicating a condensation (freezing) of structural dynamics. We use first-principles-based atomistic calculations and phase-field modelling to reveal the microscopic atomic arrangements and corroborate the frequencies of the vortex modes.

    Trvalý link: http://hdl.handle.net/11104/0320213

     
     
Počet záznamů: 1  

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