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Ultrafast optical control over nanoscale charge currents is increasingly important for emerging integrated optoelectronics and other applications. Here, we introduce versatile new hybrid nanoplasmonic-graphene sources of tailored picosecond photocurrents and demonstrate bias-free, continuously-polarization-rotatable terahertz emission.

We demonstrate perturbative optical harmonic generation up to fifth order in the topological chiral crystal RhSi under femtosecond mid-infrared excitation, with particularly strong third harmonic responses that may be linked to Berry curvature contributions.

We utilized ultrafast X-ray diffraction to investigate optically induced strain waves in the Weyl semimetal TaAs, revealing real-time structural oscillations originating from quasilongitudinal and quasi-shear acoustic phonon modes.

We measure effect of strain on Auger recombination from compositional and applied biaxial stress using time-resolved photoluminescence and pump-probe spectroscopy. Results suggest that straining by composition, but not external stress, can tune the Auger coefficient.