Everyone is familiar with the amazing performance of a modern
smartphone, powered by a billion-plus nanotransistors, each having an
active region that is barely a few hundred atoms in length.These lecture
notes are about a less appreciated by-product of the microelectronics
revolution, namely the deeper understanding of current flow, and device
operation that it has enabled, which forms the basis for a new approach
to transport problems.The book assumes very little background beyond
linear algebra and differential equations, and is intended to be
accessible to anyone in any branch of science or engineering.