Ultrafast nano-imaging of the order parameter in a structural phase transition

Till Domröse; Thomas Danz; Claus Ropers

doi:10.1117/12.2570067

20 August 2020 Ultrafast nano-imaging of the order parameter in a structural phase transition

Till Domröse, Thomas Danz, Claus Ropers

Proceedings Volume 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII; 114970K (2020) https://doi.org/10.1117/12.2570067
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Combining the temporal resolution of optical spectroscopy with the spatial resolution of electron microscopy, ultrafast transmission electron microscopy (UTEM) enables resolving out-of-equilibrium processes in heterogeneous systems on the sub-nanometer length scale using imaging, diffraction and spectroscopy ^[1]. Here, we employ the Göttingen UTEM ^[2] to unravel real-space dynamics of an order parameter to a charge-density wave (CDW) phase transition in the correlated material 1T-TaS2. Specifically, a tailored dark-field approach enables tracking of dynamics of the CDW amplitude with nanometer spatial resolution. Following a global CDW quench, we observe localized formation, condensation and subsequent spatiotemporal evolution of domain patterns on femtosecond to nanosecond time scales. We corroborate our findings by time-dependent Ginzburg-Landau simulations. ^[1] A. H. Zewail, Science 328, 187 (2010). ^[2] A. Feist et al., Ultramicroscopy 176, 63 (2017).

Conference Presentation

Citation Download Citation

Till Domröse, Thomas Danz, and Claus Ropers "Ultrafast nano-imaging of the order parameter in a structural phase transition", Proc. SPIE 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII, 114970K (20 August 2020); https://doi.org/10.1117/12.2570067

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