Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.24: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Relativistic signatures in the Kapitza-Dirac effect — •Sven Ahrens, Heiko Bauke, Carsten Müller, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The prediction of the Kapitza-Dirac effect [1], which is the diffraction of electrons by a standing wave of light, has been confirmed experimentally in recent years [2, 3]. The laser intensities, which were used in these experiments, are far below the highest intensities attainable with modern laser facilities and laser pulses with shorter wavelength are available today. Therefore, the question arises, if relativistic signatures of the Kapitza-Dirac effect are measurable in such strong laser fields.

We determine the time-evolution of the electron wavefunction by solving the Dirac equation analytically by a plane wave ansatz and with numerical simulations. We investigate the relativistic quantum dynamics and compare it to the non-relativistic Schrödinger theory focusing on relativistic signatures and spin effects in intense laser fields of short wavelengths.
[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] P. H. Bucksbaum, D. W. Schumacher, M. Bashkansky, Phys. Rev. Lett. 61, 1182–1185 (1988)