Abstract
A Dirac particle interaction with a uniform magnetic field B suddenly (by leaps) changing in time is considered theoretically. Characteristic features of the switching-on and switching-off processes are derived; in particular, it is shown that after switchings there is no spin flip if the component of the kinetic momentum along the field is equal to zero. Generalizations to more than one switching are presented. Various results of calculations of the switching process from B1 not=O to B2 not=O are also presented. Limiting non-relativistic and ultrarelativistic cases are discussed. In the non-relativistic case, derived equations transform to earlier known results. Difficulties of the one-particle interpretation are shown. Some new results of the non-relativistic case are given in an appendix.
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