Pronounced momentum shift against the radiation pressure in strong-field sequential double ionization

The nondipole effect in strong-field sequential double ionization of an Ar atom is investigated with the Heisenberg-core potential classical ensemble model, in which the magnetic component of the laser field is included. We show that the magnetic field induces a nonzero displacement of the electron along the laser propagation direction when the electron is driven back by the linearly polarized laser field. This displacement significantly affects the electron-ion rescattering, manifesting as a pronounced linear momentum transfer against the radiation pressure for the low-energy photoelectron. Such phenomenon depends on the laser intensity and traveling time of the photoelectrons. Particularly, a larger negative linear momentum transfer for low-energy electrons is obtained in a more intense laser field with longer pulse duration, in which case it would be beneficial to observe the nondipole effect in experiment.