Light-Matter Interactions at the Nanoscale: Harmonic Generation from Metal/Vacuum Interfaces and Novel Aspects of Radiation Reaction Abstract – In noble metals a patina of free electrons extends out into free space and vanishes within a fraction of an atomic diameter. We discuss the possibility and consequences of the existence of such a free electron layer,

Non-Abelian Braiding with Sound and Light Abstract – Many physics laws and mathematical rules are insensitive to order. For example, the addition of numbers disregards the sequence order, e.g., 1+2+3=3+1+2. However, such a commutative property does not always hold. When the outcomes of a set of operations depend on the execution order, they can become