Biomedical subjects
Publications and source records attributed to S Keppeler.
A semiclassical analysis based on concepts developed in quantum chaos reveals that anomalous magneto-oscillations in quasi-two-dimensional systems with spin-orbit interaction reflect the nonadiabatic spin precession of a classical spin vector along the cyclotron orbits.
Starting from a semiclassical quantization condition based on the trace formula, we derive a periodic-orbit formula for the distribution of spacings of eigenvalues with k intermediate levels. Numerical tests verify the validity of this representation for the nearest-neighbor level spacing (k=0). In a second part, we present an asymptotic evaluation for large spacings, where consistency with random matrix theory is achieved for large k. We also discuss the relation with the method of Bogomolny and Keating [Phys. Rev. Lett. 77, 1472 (1996)] for two-point correlations.