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Gauge-invariant relativistic strong-field approximation

MPG-Autoren
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Klaiber,  Michael
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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

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

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Zitation

Klaiber, M., Hatsagortsyan, K. Z., & Keitel, C. H. (2006). Gauge-invariant relativistic strong-field approximation. Physical Review A, 73(5): 053411. doi:10.1103/PhysRevA.73.053411.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-7FF6-C
Zusammenfassung
The problem of the choice of gauge in the relativistic strong-field approximation (SFA) is analyzed. The main motivation is to obtain a relativistic ionization amplitude in the SFA which in the nonrelativistic limit coincides with the conventional well-accepted results of the SFA in the length gauge. A gauge-invariant formulation of the SFA is derived which is applicable both in the nonrelativistic as well as in the relativistic regime of laser-induced strong-field ionization phenomena. The gauge invariance is achieved by means of employment of an eigenstate of the physical energy operator for the initial atomic state. As an example, a comparison of predictions of the gauge-invariant theory with conventional SFA results in the radiation gauge is given for above-threshold ionization in the relativistic regime.