These materials are known as electrical insulators. Make a list of all of the objects that you can see in the room. Separate these objects into conductors and insulators. Explain how you know if a ...

Experiment has now proved the existence of the predicted three-dimensional 'topological insulator' in the semiconducting alloy Bi 1−x Sb x. One of the triumphs of quantum mechanics in the ...

Electric charges on the boundaries of certain insulators are programmed by topology ... topological invariants — that do not change when objects are subjected to continuous deformations.