Abstract
A short survey of the semi-classical periodic orbit theory, initiated by Gutzwiller and generalized by many other authors, is given. Via so-called semi-classical trace formulae, gross-shell effects in bound fermion systems can be interpreted in terms of a few periodic orbits of the corresponding classical systems. In integrable systems, these are usually the shortest members of the most degenerate families or orbits, but in some systems also less degenerate orbits can determine the gross-shell structure. Applications to nuclei, metal clusters, semiconductor nanostructures and trapped dilute atom gases are discussed.
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