Planar Dirac diffusion

Details Planar Dirac diffusion Planar Dirac diffusion

2010-02-23

arxiv.org/abs/1002.4324v1

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.

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