Near atomically smooth alkali antimonide photocathode thin films

Chiral atomically thin films.

Chiral materials possess left- and right-handed counterparts linked by mirror symmetry. These materials are useful for advanced applications in polarization optics, stereochemistry and spintronics. In particular, the realization of spatially uniform chiral films with atomic-scale control of their handedness could provide a powerful means for developing nanodevices with novel chiral properties. ...

Atomically Uniform Thin Films on Silicon

Depinning of atomically thin Kr films on gold.

We have employed the quartz-crystal microbalance technique to measure the sliding friction of krypton films physisorbed on gold. By slowly increasing the amplitude of the substrate oscillations, we have observed a sharp transition from a film locked to the substrate to a sliding one. This transition is characterized by hysteresis both in dissipation and inertial mass as the amplitude is decreas...

Exciton-dominated Dielectric Function of Atomically Thin MoS2 Films

We systematically measure the dielectric function of atomically thin MoS2 films with different layer numbers and demonstrate that excitonic effects play a dominant role in the dielectric function when the films are less than 5-7 layers thick. The dielectric function shows an anomalous dependence on the layer number. It decreases with the layer number increasing when the films are less than 5-7 ...

Thermal capillary waves relaxing on atomically thin liquid films

Atomistic simulations are used to investigate the relaxation dynamics of thermal capillary waves on thin flat liquid films. Short Lennard-Jones polymers n=2, 4, and 8 model the liquid in films of thickness 6 to 96 , where is the Lennard-Jones atomic length-scale parameter. Assuming no-slip boundary conditions on the solid wall and constant surface tension and viscosity, the standard continuum m...