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Relativistic spin operators in various electromagnetic environments

MPS-Authors
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Bauke,  Heiko
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Ahrens,  Sven
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Keitel,  Christoph H.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Grobe,  Rainer
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Intense Laser Physics Theory Unit and Department of Physics, Illinois State University, Normal, Illinois 61790-4560, USA;

External Ressource
Fulltext (public)

1403.0550.pdf
(Preprint), 685KB

Supplementary Material (public)
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Citation

Bauke, H., Ahrens, S., Keitel, C. H., & Grobe, R. (2014). Relativistic spin operators in various electromagnetic environments. Physical Review A, 89(5): 052101. doi:10.1103/PhysRevA.89.052101.


Cite as: http://hdl.handle.net/11858/00-001M-0000-001A-02D5-3
Abstract
Different operators have been suggested in the literature to describe the electron's spin degree of freedom within the relativistic Dirac theory. We compare concrete predictions of the various proposed relativistic spin operators in different physical situations. In particular, we investigate the so-called Pauli, Foldy-Wouthuysen, Czachor, Frenkel, Chakrabarti, Pryce, and Fradkin-Good spin operators. We demonstrate that when a quantum system interacts with electromagnetic potentials the various spin operators predict different expectation values. This is explicitly illustrated for the scattering dynamics at a potential step and in a standing laser field and also for energy eigenstates of hydrogenic ions. Therefore, one may distinguish between the proposed relativistic spin operators experimentally.