Qing Li

TL;DR: In this article, the first experimental study of thermal transport at the nanoscale is reported in the case of a point-like heat source, providing a quantitative description of the transition between the ballistic and diffusive regimes.

TL;DR: In this paper, the authors used diffraction of coherent soft x-ray pulses for very high resolution of thermally-induced surface distortion, as well as femtosecond time resolution of dynamics.

TL;DR: A spectral decomposition of the calculated response on the eigemodes of the system reveals asymmetric resonances that result from the coupling between surface and bulk acoustic modes, which expands the understanding of the scattering of surface waves in mesoscale metamaterials.

TL;DR: In this paper, a thermomechanics from first-principles is used to calculate the system's initial heat-driven impulsive response and follow its time evolution to quantitatively access frequencies and lifetimes of the composite system's excited eigenmodes.

TL;DR: In this paper, the authors used ultrafast, coherent, extreme ultraviolet beams to extend optical measurements of propagation dynamics of surface acoustic waves to frequencies of nearly 50 GHz, corresponding to wavelengths as short as 125 nm.