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Showing 1–7 of 7 results
Advanced filters: Author: Masaaki Ashida Clear advanced filters

  • In classical hydrodynamics, Kelvin waves refer to helically vibrating normal modes. Experiments now show that quantum analogues of Kelvin waves can be excited in superfluid helium-4.

    • Yosuke Minowa
    • Yuki Yasui
    • Masaaki Ashida
    Research
    Nature Physics
    Volume: 21, P: 233-238

  • Here the authors expand the application scope of terahertz spectroscopy to the characterization of electrolyte materials. Based on the measurement of the conductivity of yttria-stabilized zirconia in the terahertz frequency range, unprecedented insight into the microscopic motion of the ion is revealed.

    • Tomohide Morimoto
    • Masaya Nagai
    • Yukimune Kani
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8

  • In semiconductor nanocrystals, efficient carrier multiplication counteracts hot carrier thermalization, increasing the overall carrier generation yield. Here, de Weerd et al. observe a quantum yield of up to 98% in CsPbI3 nanocrystals as a result of efficient carrier multiplication.

    • Chris de Weerd
    • Leyre Gomez
    • Tom Gregorkiewicz
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-9

  • Trapping of a terahertz wave in a photonic-crystal slab and subsequent ‘capture’ through absorption are demonstrated. Over 90% of the wave lying within 17% of the centre frequency is absorbed. Application to the stabilization of terahertz wireless communication systems is shown.

    • Ryoma Kakimi
    • Masayuki Fujita
    • Tadao Nagatsuma
    Research
    Nature Photonics
    Volume: 8, P: 657-663

  • Martensitic crystal structures are usually obtained by rapid thermal quenching of certain alloys, as this induces local shear deformation. This paper reveals that the latter, and hence a martensitic structural transformation, can also be achieved by exciting a suitable transverse phonon mode, as is demonstrated in partially stabilized zirconia by using intense terahertz pulses.

    • Masaya Nagai
    • Yuhei Higashitani
    • Norimasa Ozaki
    ResearchOpen Access
    Communications Physics
    Volume: 6, P: 1-9