Solymar L., Walsh D. Electrical Properties Of Materials

7-th ed. — Oxford University Press, 2004. — 414 p.
Solid-state electronic devices are in a different category. In order to understand their behaviour, you need to delve into quantum mechanics. We live in a classical world. The phenomena we meet every day are classical phenomena. The fine details represented by quantum mechanics are averaged out; we have no first-hand experience of the laws of quantum mechanics; we can only infer the existence of certain relationships from the final outcome. Will it be always this way? Not necessarily. There are quantum phenomena known to exist on a macroscopic scale as, for example, superconductivity, and it is quite likely that certain biological processes will be found to represent macroscopic quantum phenomena.