Author(s): M. Arndt
Journal: Compendium of Quantum Physics
DOI Number: 10.1007/978-3-540-70626-7_197
Link: Link to publication
Within the literature on quantum physics the word “semi-classical” is used both very often and with different meanings. But three situations are most commonly encountered: Firstly, quantum systems that are approximated by classical models at high ►quantum numbers. Secondly, the mathematical description of composite systems which can be simplified by dividing the problem into a classical and a quantum sector. And finally, open quantum systems which reveal classical properties in their interaction with a complex environment.
The various definitions of semi-classicality apply to a vast range of physical systems, covering quantum optics , atomic physics , molecular physics , mesoscopic and solid state physics  or even ►quantum gravity . A recent and comprehensive resource letter by Gutzwiller  provides nearly four hundred commented references to important papers on that subject. And a number of these papers have been collected and reprinted in .