Transient lensing from a photoemitted electron gas imaged by ultrafast electron microscopy.

Nature Communications
Omid ZandiRenske M van der Veen

Abstract

Understanding and controlling ultrafast charge carrier dynamics is of fundamental importance in diverse fields of (quantum) science and technology. Here, we create a three-dimensional hot electron gas through two-photon photoemission from a copper surface in vacuum. We employ an ultrafast electron microscope to record movies of the subsequent electron dynamics on the picosecond-nanosecond time scale. After a prompt Coulomb explosion, the subsequent dynamics is characterized by a rapid oblate-to-prolate shape transformation of the electron gas, and periodic and long-lived electron cyclotron oscillations inside the magnetic field of the objective lens. In this regime, the collective behavior of the oscillating electrons causes a transient, mean-field lensing effect and pronounced distortions in the images. We derive an analytical expression for the time-dependent focal length of the electron-gas lens, and perform numerical electron dynamics and probe image simulations to determine the role of Coulomb self-fields and image charges. This work inspires the visualization of cyclotron dynamics inside two-dimensional electron-gas materials and enables the elucidation of electron/plasma dynamics and properties that could benefit the dev...Continue Reading

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Citations

Oct 17, 2020·Structural Dynamics·Pavel K OlshinUlrich J Lorenz
Jan 9, 2021·Structural Dynamics·Shuaishuai SunChong-Yu Ruan

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Methods Mentioned

BETA
electron microscopy
X-ray
electron diffraction

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