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Showing 1–6 of 6 results
Advanced filters: Author: Timm Rohwer Clear advanced filters

  • Angle-resolved photoemission spectroscopy (ARPES) is widely used to study the electronic structure of a wide range of correlated materials. Time-resolved ARPES allows the study of the response of such electronic features on ultrafast timescales; this paper now adds an exciting new dimension by using high photon energies that allow the study of ultrafast dynamics at high momenta, where often the most interesting fundamental phenomena occur. The technique is applied to the charge density wave material 1T-TiSe2 and it is shown with stroboscopic imaging of the electronic band structure at high momentum that atomic-scale periodic long-range order collapses on a surprisingly short timescale of 20 femtoseconds.

    • Timm Rohwer
    • Stefan Hellmann
    • Michael Bauer
    Research
    Nature
    Volume: 471, P: 490-493

  • Currently, it is difficult to reach high momenta with narrow energy resolution via laser-based angle-resolved photoemission spectroscopy (ARPES). Here, Sie et al. develop a time-resolved XUV based ARPES setup which can access the first Brillouin zone of all materials with narrow energy resolution.

    • Edbert J. Sie
    • Timm Rohwer
    • Nuh Gedik
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-11

  • Short pulses of light shift the balance between two competing charge density wave phases, allowing the weaker one to manifest transiently while suppressing the stronger one. This shows that competing phases can be tuned in a non-equilibrium setting.

    • Anshul Kogar
    • Alfred Zong
    • Nuh Gedik
    Research
    Nature Physics
    Volume: 16, P: 159-163

  • Three different ultrafast probes investigate a non-adiabatic phase transition and find substantial evidence of topological defects inhibiting the reformation of the equilibrium phase.

    • Alfred Zong
    • Anshul Kogar
    • Nuh Gedik
    Research
    Nature Physics
    Volume: 15, P: 27-31

  • A terahertz-driven photogun with field gradients of 3 GV m−1 is demonstrated by using a few microjoules of single-cycle terahertz radiation. The emitted electrons are accelerated up to 14 keV and can be focused down to 90 μm. The electron bunch is further compressed to 167 fs.

    • Jianwei Ying
    • Xie He
    • Dongfang Zhang
    Research
    Nature Photonics
    Volume: 18, P: 758-765