|
Matthias Brack
UR, Regensburg
Periodic orbit theory including spin degrees of freedom
We summarize recent developments of the semiclassical description
of shell effects in finite fermion systems with explicit inclusion
of spin degrees of freedom, in particluar in the presence of
spin-orbit interactions. We present a new approach that makes use
of spin coherent states and a correspondingly enlarged classical
phase space. Taking suitable limits, we can recover some of the
earlier approaches. Special attention is given to the determination
of Maslov indices and other phases. Applications to various model
systems will be presented.
| |