Femtosecond electrons probing currents and atomic structure in nanomaterials

Area of Science:

• Condensed Matter Physics
• Materials Science
• Ultrafast Spectroscopy

Background:

• Investigating ultrafast dynamics in low-dimensional systems requires high-resolution femtosecond probes.
• Low-energy electrons offer strong interactions but suffer from dispersion, limiting their use in time-resolved experiments.

Purpose of the Study:

• To develop a hybrid approach for femtosecond point projection microscopy and low-energy electron diffraction.
• To overcome the limitations of electron dispersion for ultrafast probing.

Main Methods:

• Utilizing a laser-triggered point-like source of electron wave packets.
• Implementing a hybrid microscopy and diffraction technique.
• Employing femtosecond temporal resolution and nanometer spatial resolution.

Main Results:

• Achieved sub-100 femtosecond temporal resolution and few 10 nm spatial resolution.
• Successfully investigated ultrafast electric currents in nanowires.
• Demonstrated potential for studying structural dynamics in crystalline single-layer materials.

Conclusions:

• The developed hybrid approach enables high-resolution ultrafast studies of low-dimensional materials.
• This technique opens new avenues for understanding electron and structural dynamics at the nanoscale.