N. Peter Armitage (born 1971) is an American physicist who is currently a Professor of Physics and Astronomy at The Johns Hopkins University.
His principal scientific interest is understanding how is it that large ensembles of strongly interacting, but fundamentally simple particles like electrons in solids act collectively to exhibit complex emergent quantum phenomena.
The material systems of interest require new measurement techniques as their relevant frequencies typically fall between the range of usual optical and electronic methods.
He is known primarily for is work on superconductivity, magnetism, disordered systems, and topological materials.
At Johns Hopkins, his group has measured the quantized magnetoelectric "axion" response of topological insulators.