Femtosecond electrons probing currents and atomic structure in nanomaterials

Melanie Müller (), Alexander Paarmann and Ralph Ernstorfer ()
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Melanie Müller: Fritz-Haber-Institut der Max-Planck-Gesellschaft
Alexander Paarmann: Fritz-Haber-Institut der Max-Planck-Gesellschaft
Ralph Ernstorfer: Fritz-Haber-Institut der Max-Planck-Gesellschaft

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The investigation of ultrafast electronic and structural dynamics in low-dimensional systems such as nanowires and two-dimensional materials requires femtosecond probes providing high spatial resolution and strong interaction with small volume samples. Low-energy electrons exhibit large scattering cross-sections and high sensitivity to electric fields, but their pronounced dispersion during propagation in vacuum so far prevented their use as femtosecond probe pulses in time-resolved experiments. Here, employing a laser-triggered point-like source of either divergent or collimated electron wave packets, we developed a hybrid approach for femtosecond point projection microscopy and femtosecond low-energy electron diffraction. We investigate ultrafast electric currents in nanowires with sub-100 femtosecond temporal and few 10 nm spatial resolutions, and demonstrate the potential of our approach for studying structural dynamics in crystalline single-layer materials.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6292

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DOI: 10.1038/ncomms6292

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