Probing Excitons, Trions, and Dark Excitons in Monolayer WS Using Resonance Raman Spectroscopy.

We present temperature-dependent resonance Raman measurements on monolayer WS for the temperature range 4-295 K using excitation photon energies from 1.9 to 2.15 eV in ∼7 meV steps.

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems.

This paper briefly describes how nanowires with diameters corresponding to 1 to 5 atoms can be produced by melting a range of inorganic solids in the presence of carbon nanotubes. These nanowires are extreme in the sense that they are the limit of miniaturization of nanowires and their behavior is not always a simple extrapolation of the behavior of larger nanowires as their diameter decreases. The paper then describes the methods required to obtain Raman spectra from extreme nanowires and the fact that due to the van Hove singularities that 1D systems exhibit in their optical density of states, that determining the correct choice of photon excitation energy is critical.