Extension of the Foldy-Wouthuysen Transformation
- 1 December 1962
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 128 (5) , 2454-2458
- https://doi.org/10.1103/physrev.128.2454
Abstract
By use of Moyal's representation and a perturbation theory developed by the author, we remove the interband matrix elements of the Dirac Hamiltonian in the presence of external fields. The result is exact in terms of velocity, but appears as a series in the field strengths and their derivatives, which is evaluated to second order in the fields and first order in their first derivatives.Keywords
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