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A: Fachverband Atomphysik

A 7: Interaction with strong or short laser pulses

A 7.6: Vortrag

Montag, 11. März 2019, 15:30–15:45, S HS 3 Physik

Photoelectron holography beyond the electric dipole approximation — •Simon Brennecke and Manfred Lein — Institut für Theoretische Physik, Appelstraße 2, 30167 Hannover, Germany

Photoelectron holography is an ultrafast laser-based imaging technique which produces measurable interference patterns in electron momentum distributions. Its interpretation is usually carried out in electric dipole approximation. However, today’s experiments [Phys. Rev. Lett. 113, 243001 (2014)] are capable of revealing beyond-dipole effects such as a counter-intuitive shift of the momenta into the direction opposite to the laser propagation direction for low electron energies in linearly-polarized fields. We calculate the momentum-dependent shift of the holographic structure by extending the quantum trajectory-based Coulomb-corrected strong-field approximation (CCSFA) beyond the electric dipole approximation. The theory is set up such that in the limit of vanishing potential, it reproduces the beyond-dipole strong-field approximation. The comparison with the numerical solution of the time-dependent Schrödinger equation in 2D and 3D shows that the point of constructive interference between different trajectories describes quantitatively the position of the central maximum in the momentum distribution. Interestingly, this point of constructive interference coincides with the position of the classical ridge due to Coulomb-focusing in 3D [Phys. Rev. A. 97, 063409 (2018)].