• Alternative gauge for the description of the light-matter interaction in a relativistic framework 

      Selstø, Sølve; Kjellsson, Tor; Lindroth, Eva; Simonsen, Aleksander; Førre, Morten (Journal article; Peer reviewed, 2017)
      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 ...
    • Ionization dynamics beyond the dipole approximation induced by the pulse envelope 

      Simonsen, Aleksander; Kjellsson, Tor; Førre, Morten; Lindroth, Eva; Selstø, Sølve (Peer reviewed; Journal article, 2016-05-16)
      When atoms and molecules are ionized by laser pulses of finite duration and increasingly high intensities, the validity of the much-used dipole approximation, in which the spatial dependence and magnetic component of the ...
    • Relativistic effects in photoionizing a circular Rydberg state in the optical regime 

      Kjellsson Lindblom, Tor Hugo Iwao; Lindroth, Eva; Førre, Morten; Selstø, Sølve (Physical Review A (PRA);102, 063108 (2020), Journal article; Peer reviewed, 2020-12-11)
      We study the photoionization process of a hydrogen atom initially prepared in a circular Rydberg state. The atom is exposed to a two-cycle laser pulse with a central wavelength of 800 nm. Before the atom approaches saturation, ...
    • Schrödinger formulation of the nondipole light-matter interaction consistent with relativity 

      Førre, Morten; Selstø, Sølve (Physical Review A (PRA);Vol. 101, Iss. 6 — June 2020, Journal article; Peer reviewed, 2020-06-25)
      An alternative and powerful Schrödinger-like equation for describing beyond dipole laser-matter interactions and leading relativistic corrections is derived. It is shown that this particular formulation is numerically very ...
    • Semirelativistic Schrödinger Equation for Relativistic Laser-Matter Interactions 

      Kjellsson Lindblom, Tor; Førre, Morten; Lindroth, Eva; Selstø, Sølve (Physical Review Letters;Vol. 121, Iss. 25 — 21 December 2018, Journal article; Peer reviewed, 2018)
      A semirelativistic formulation of light-matter interaction is derived using the so called propagation gauge and the relativistic mass shift. We show that relativistic effects induced by a superintense laser field can, to ...