Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Electron scattering and recombination

A 37.6: Vortrag

Donnerstag, 20. März 2014, 12:00–12:15, BEBEL E42

Spin-dependent Kapitza-Dirac diffraction in a two-color laser field — •Matthias Maximilian Dellweg and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf

The Kapitza-Dirac effect [1] is the diffraction of an electron beam on the periodic potential generated by a standing light wave. An experimental verification of the effect, as originally proposed, was accomplished only recently [2]. Spin effects due to 3-photon interaction have been predicted for X-ray photons [3].

We study a generalization of the Kapitza-Dirac effect to the case of a bifrequent light field, which allows 3-photon interactions to occur even in the nonrelativistic regime. To this end, we solve the Pauli equation numerically for the relevant momentum eigenstates, and compare the results with fourth order perturbation theory.

A

[1] P. L. Kapitza, P. A. M. Dirac, Proc. Cambridge Philos. Soc. 29, 297-300 (1933)

[2] D. L. Freimund, K. Aflatooni, H. Batelaan, Nature 413, 142-143 (2001)

[3] S. Ahrens, H. Bauke, C. H. Keitel, C. Müller, Phys. Rev. Lett. 109, 043601 (2012)