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Showing 1–8 of 8 results
Advanced filters: Author: S. Winnerl Clear advanced filters

  • Josephson plasma solitons are a kind of excitation predicted to occur in cuprate superconductors subject to strong electromagnetic fields. By using intense radiation from a free-electron laser, these modes are now demonstrated experimentally in the copper oxide material La1.84Sr0.16CuO4.

    • A. Dienst
    • E. Casandruc
    • A. Cavalleri
    Research
    Nature Materials
    Volume: 12, P: 535-541

  • Using short pulses in the terahertz spectral range following optical injection, ultrafast excitation of trions to excitons and free carriers in monolayer MoSe2 can be realized within picoseconds, advancing nanoscale optoelectronics devices.

    • Tommaso Venanzi
    • Marzia Cuccu
    • Alexey Chernikov
    Research
    Nature Photonics
    Volume: 18, P: 1344-1349

  • Landau levels in graphene are not equidistant so that transitions between them can be individually probed. Time-resolved optical pumping experiments reveal strong electron–electron scattering resulting in an Auger-depleted zeroth order Landau level.

    • Martin Mittendorff
    • Florian Wendler
    • Stephan Winnerl
    Research
    Nature Physics
    Volume: 11, P: 75-81

  • Quantum cascade lasers are only one of several applications that could take advantage of the discrete nature of the energy levels in semiconductor quantum dots. It is now shown that the relaxation time between levels is highly sensitive to their energy separation. This knowledge will be essential for the design and optimization of actual devices.

    • E. A. Zibik
    • T. Grange
    • L. R. Wilson
    Research
    Nature Materials
    Volume: 8, P: 803-807

  • The authors provide an experimental demonstration of magnetic field generation in graphene disks via the inverse Faraday effect. When the disks are illuminated with circularly polarized radiation in resonance with the graphene plasmon frequency, the corresponding rotational motion of the charge carriers gives rise to a unipolar magnetic field.

    • Jeong Woo Han
    • Pavlo Sai
    • Martin Mittendorff
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-7

  • Ultrashort pulses covering the 1–30 THz range are generated from a W/CoFeB/Pt trilayer and originate from photoinduced spin currents, the inverse spin Hall effect and a broadband Fabry–Pérot resonance. The resultant peak fields are several 100 kV cm–1.

    • T. Seifert
    • S. Jaiswal
    • T. Kampfrath
    Research
    Nature Photonics
    Volume: 10, P: 483-488