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Showing 1–14 of 14 results
Advanced filters: Author: Ralph Ernstorfer Clear advanced filters

  • Here, the authors investigate the interfacial charge/energy transfer dynamics in a WSe2/graphene heterostructure. They unveil an energy transfer mechanism from WSe2 to graphene mediated by an interfacial Meitner-Auger process, resulting in a transient hole distribution in the Dirac cone at energies larger than the photon energy of the optical excitation.

    • Shuo Dong
    • Samuel Beaulieu
    • Ralph Ernstorfer
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-8

  • Time- and angle-resolved photoemission spectroscopy is used to observe the primary step of singlet fission with orbital resolution indicating a charge-transfer mediated mechanism with a hybridization of states in the lowest bright singlet exciton.

    • Alexander Neef
    • Samuel Beaulieu
    • Ralph Ernstorfer
    ResearchOpen Access
    Nature
    Volume: 616, P: 275-279

  • Femtosecond low-energy electron pulses allow probing ultrafast processes in nanoscale systems with high spatial and temporal resolution. Here, the authors develop a hybrid approach for studying ultrafast electric currents and structural dynamics in low-dimensional systems.

    • Melanie Müller
    • Alexander Paarmann
    • Ralph Ernstorfer
    Research
    Nature Communications
    Volume: 5, P: 1-8

  • Exposing a fused silica sample to a strong, waveform-controlled, few-cycle optical field increases the dielectric’s optical conductivity by more than 18 orders of magnitude in less than 1 femtosecond, allowing electric currents to be driven, directed and switched by the instantaneous light field.

    • Agustin Schiffrin
    • Tim Paasch-Colberg
    • Ferenc Krausz
    Research
    Nature
    Volume: 493, P: 70-74

  • Electron diffraction is used to show that the melting of crystalline bismuth after laser excitation occurs exceptionally fast, within half the period of a lattice vibration. The extraordinary fast melting is attributed to profound laser-induced changes in the potential energy surface of the bismuth lattice: in the changed potential, the atoms experience strong driving forces that launch them from their initial equilibrium positions and towards the disorder typical of liquids.

    • Germán Sciaini
    • Maher Harb
    • R. J. Dwayne Miller
    Research
    Nature
    Volume: 458, P: 56-59

  • A solid-state device is demonstrated that can detect the absolute offset between the carrier wave and envelope of an ultrashort pulse, the carrier–envelope phase. It holds promise for routine measurement and monitoring of the carrier–envelope phase in attosecond experimental set-ups.

    • Tim Paasch-Colberg
    • Agustin Schiffrin
    • Ferenc Krausz
    Research
    Nature Photonics
    Volume: 8, P: 214-218

  • A computational workflow centered on probabilistic machine learning is developed to reconstruct the energy dispersion from photoemission band-mapping data. The workflow uncovers previously inaccessible momentum-space structural information at scale.

    • R. Patrick Xian
    • Vincent Stimper
    • Ralph Ernstorfer
    ResearchOpen Access
    Nature Computational Science
    Volume: 3, P: 101-114

  • The physical properties of a solid-state material depends on its electronic structure, which can be studied using angle-resolved photoemission spectroscopy (ARPES). This Primer introduces the ARPES technique and describes how different variants can be used for applications including superconductors, topological materials and two-dimensional materials.

    • Hongyun Zhang
    • Tommaso Pincelli
    • Shuyun Zhou
    Reviews
    Nature Reviews Methods Primers
    Volume: 2, P: 1-22