The prospect of a nanoscale light source emitting at a wavelength that can be tuned by the user is enticing for researchers working in many areas of nanoscience and technology, including the ...

In solid matter, this is done using spectroscopy, which is the same field that can help scientists identify stars and black holes. Only those beach ball-like free electrons respond to the spectroscopy ...

Metals have lots of electrons, and some of them are free to move through the metal, so when they’re connected in a circuit, the electrons can easily flow. This flow of electric charge is called ...