Evaluation demonstrates the feasibility of time-resolved electron spectroscopy for probing quantum materials, implying new insights into electronic structures.
To develop a feasible methodology to observe the dynamics of element-specific electronic structures, collective excitations, and lattice structures, we are going to implement a time-resolved resonant electron energy-loss spectroscopy (TR-rEELS), which is expected to pave the way for exploring unconventional phenomena in quantum materials. Before the implementation, to determine the optimal parameters of the probe electron beam and to verify the feasibility of this methodology, we evaluated the profile and the space-charge effect of the pulsed electron beam with a kinetic energy less than 2 keV based on both simulation and experiment. By controlling the initial electron beam parameters, we realized an energy width less than 2 eV with a calculated temporal width of ∼30 ps, enabling the time-resolved measurement, while maintaining a sufficient signal-to-noise ratio, and, thus, showed the feasibility of TR-rEELS. An experimental demonstration result of TR-EELS using this apparatus is also introduced.
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Nishihara et al. (2026) studied this question.
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