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  1. Article

    Open Access

    Nonequilibrium charge-density-wave order beyond the thermal limit

    The interaction of many-body systems with intense light pulses may lead to novel emergent phenomena far from equilibrium. Recent discoveries, such as the optical enhancement of the critical temperature in cert...

    J. Maklar, Y. W. Windsor, C. W. Nicholson, M. Puppin, P. Walmsley… in Nature Communications (2021)

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  2. No Access

    Article

    Direct observation of electron propagation and dielectric screening on the atomic length scale

    Attosecond light pulses are now available experimentally, enabling ultrafast processes on the atomic scale to be probed; here the free-electron-like propagation of electrons through ultrathin layers of magnesi...

    S. Neppl, R. Ernstorfer, A. L. Cavalieri, C. Lemell, G. Wachter, E. Magerl… in Nature (2015)

  3. No Access

    Chapter and Conference Paper

    Visualization of Photocurrents in Nanoobjects by Ultrafast Low-Energy Electron Point-Projection Imaging

    Ultrafast photocurrents in pin-type semiconductor InP nanowires are investigated with femtosecond time and nanometer spatial resolution. We demonstrate the capability of femtosecond point-projection imaging as...

    M. Müller, A. Paarmann, R. Ernstorfer in Ultrafast Phenomena XIX (2015)

  4. No Access

    Article

    Collinear generation of ultrashort UV and XUV pulses for pump/probe spectroscopyCollinear generation of ultrashort UV and XUV pulses for pump/probe spectroscopyCollinear generation of ultrashort UV and XUV pulses for pump/probe spectroscopyCollinear generation of ultrashort UV and XUV pulses for pump/probe spectroscopy

    The collinear generation of sub-4 fs ultraviolet (UV) and attosecond extreme ultraviolet (XUV) pulses via subsequent third-harmonic and high harmonic generation in noble gases is demonstrated. The ultrashort c...

    E. Bothschafter, A. Schiffrin, F. Krausz, R. Ernstorfer… in MRS Online Proceedings Library (2010)

  5. No Access

    Chapter and Conference Paper

    Atomic View of the Photoinduced Collapse of Gold and Bismuth

    Two different mechanisms of photoinduced melting were studied by femtosecond electron diffraction. The structural response of gold indicates an electronically-induced increase of the melting temperature. Bismu...

    R. Ernstorfer, M. Harb, C. T. Hebeisen, G. Sciaini… in Ultrafast Phenomena XVI (2009)

  6. No Access

    Article

    Dynamics of photoinduced electron transfer from adsorbed molecules into solids

    Ultrafast interfacial electron transfer from the donor orbital of organic chromophores into empty electronic acceptor states of a semiconductor and of a metal was investigated by two-photon photoemission spect...

    L. Gundlach, R. Ernstorfer, F. Willig in Applied Physics A (2007)

  7. No Access

    Chapter and Conference Paper

    Dynamics of electron injection from the excited state of anchored molecules into semiconductors

    A complete picture of different interfacial electron transfer dynamics has been obtained from transient absorption and two-photon photoemission data when inserting different anchor/bridge groups between the ex...

    L. Gundlach, R. Ernstorfer, F. Willig in Ultrafast Phenomena XV (2007)

  8. No Access

    Article

    Distance dependence of heterogeneous electron transfer probed in ultra-high vacuum with femtosecond transient absorption

    Electron injection from the excited singlet state of the molecular chromophore perylene into the wide-band-gap semiconductor TiO2 was investigated in ultra-high vacuum employing femtosecond transient absorption (...

    R Ernstorfer, S Felber, W Storck, E Galoppini, Q Wei… in Research on Chemical Intermediates (2005)

  9. No Access

    Article

    Femtosecond two-photon photoemission at 150 kHz utilizing two noncollinear optical parametric amplifiers for measuring ultrafast electron dynamics

    An improved setup for femtosecond two-photon photoemission spectroscopy (TR-2PPE) is presented. Two noncollinear optical parametric amplifiers (NOPA) were operated simultaneously at a repetition rate of 150 kH...

    L. Gundlach, R. Ernstorfer, E. Riedle, R. Eichberger, F. Willig in Applied Physics B (2005)

  10. No Access

    Chapter and Conference Paper

    Ultrafast electron transfer via a bridge-extended donor orbital

    Electron transfer from the excited aromatic donor perylene to TiO2 occurred with 10 fs time constant via the conjugated -CH=CH- bridge unit compared to 57 fs in the presence of the saturated -CH2-CH2- bridge unit...

    R. Ernstorfer, L. Gundlach, S. Felber, W. Storck, R. Eichberger… in Ultrafast Phenomena XIV (2005)

  11. No Access

    Chapter and Conference Paper

    Ultrafast molecule to semiconductor electron transfer via different anchor groups in ultra-high vacuum

    Electron transfer in the wide band limit occurs from the donor perylene to TiO2 via the carboxyl group in 13 fs and via the phosphonate group in 28 fs under ultra-high vacuum (UHV) conditions.

    R. Ernstorfer, L. Gundlach, S. Felber, R. Eichberger… in Ultrafast Phenomena XIV (2005)

  12. No Access

    Chapter

    Generation of sub-20 fs Tunable Visible Pulses from a 100 kHz NOPA For Measuring Ultrafast Heterogeneous Electron Transfer

    We describe the design and performance of a noncollinear optical parametric amplifier that can be pumped by the output of a commercial 100 kHz Ti:sapphire regenerative amplifier. The output of the NOPA is comp...

    R. Ernstorfer, L. Gundlach, C. Zimmermann, F. Willig, R. Eichberger… in Ultrafast Optics IV (2004)

  13. No Access

    Article

    Dynamics of electron scattering between bulk states and the C1 surface state of InP(100)

    Hot electron dynamics was investigated, with a focus on scattering between bulk states and the C1 surface state that is formed on the (2×4)-reconstructed In-rich surface of InP(100). The latter surface was prepar...

    L. Töben, L. Gundlach, T. Hannappel, R. Ernstorfer, R. Eichberger… in Applied Physics A (2004)