Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-02-23
Eur.Phys.J.C63:157-162,2009
Physics
High Energy Physics
High Energy Physics - Theory
6 pages, 2 figures
Scientific paper
10.1140/epjc/s10052-009-1060-9
We present the results of the planar diffusion of a Dirac particle by step and barrier potentials, when the incoming wave impinges at an arbitrary angle with the potential. Except for right-angle incidence this process is characterized by the appearance of spin flip terms. For the step potential, spin flip occurs for both transmitted and reflected waves. However, we find no spin flip in the transmitted barrier result. This is surprising because the barrier result may be derived directly from a two-step calculation. We demonstrate that the spin flip cancellation indeed occurs for each particle (wave packet) contribution.
Leo Stefano de
Rotelli Pietro
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