An insulator has a band structure in which occupied ... of topological insulators is the existence of gapless states on the sample boundary. Such states always occur at the spatial interface ...

For electricity to flow, you need a conductor. That plastic bottle, that’s an insulator, they don’t let electricity pass through. No, not that either, wood’s an insulator too. We’ve got to ...

A RIKEN study shows that squeezing the right amount of potassium ions between the atomic layers of molybdenum disulfide can ...