Phys. Rev. Focus24, 23 (2009) – Published December 15, 2009
A method combining a traditional laser pump-probe experiment with the detection of high-frequency sound and thermal waves reveals the microscopically bumpy interface between two apparently smooth surfaces.
Phys. Rev. Focus24, 9 (2009) – Published September 4, 2009
According to a new theory, the extreme hardness of new layered materials comes from the strength of chemical bonds that are oriented perpendicular to the deforming force, rather than parallel, as might be expected.