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Recollected by his colleagues as a creative and humble scholar with an indomitable will, Byoungho Lee was enthusiastic about realizing the holistic potential of holographic displays.
Quantum recoil is experimentally observed via photon energy shifts in Smith–Purcell radiation. Leveraging van der Waals materials as atomic-scale gratings, the quantum recoil is measured at room temperature on a tabletop platform.
Relative synchronization between free-electron laser pulses and a near-infrared field fields is achieved with 24 as resolution by using a correlation analysis of single-shot photoelectron spectra. It is applied to coherently control the photoionization process in neon atom on the attosecond timescale.
A tunable terahertz radiation pulse is demonstrated based on a linear accelerator. The emission frequency of this terahertz radiation is tunable from 1 to 10 THz by changing the bunching frequency of a 34 MeV electron beam. The pulse energy is at the submillijoule level.
Two-dimensional massive and massless Dirac fermions in HgTe/CdHgTe quantum wells yield terahertz Landau emission. The emission frequency is continuously tunable with magnetic field or carrier concentration, over the range from 0.5 to 3 THz.