Alternative gauge for the description of the light-matter interaction in a relativistic framework
Journal article, Peer reviewed
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Original versionSelstø S, Kjellsson T, Lindroth E, Simonsen AS, Førre M. Alternative gauge for the description of the light-matter interaction in a relativistic framework. Physical Review A. Atomic, Molecular, and Optical Physics. 2017;96(023426) https://doi.org/10.1103/PhysRevA.96.023426
We present a generalized velocity gauge form of the relativistic laser-matter interaction. In comparison with the (equivalent) regular minimal coupling description, this form of light-matter interaction results in superior convergence properties for the numerical solution of the time-dependent Dirac equation. This applies both to the numerical treatment and, more importantly, to the multipole expansion of the laser field. The advantages of the alternative gauge is demonstrated in hydrogen by studies of the dynamics following the impact of superintense laser pulses of extreme ultraviolet wavelengths and subfemtosecond duration.