Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 38: Atoms in Strong Fields II

A 38.6: Vortrag

Freitag, 10. März 2017, 15:45–16:00, N 2

Electron spin filter and polarizer in a standing light wave — •Sven Ahrens — Beijing Computational Science Research Center, Building 9, East Zone, ZPark II, No.10 East Xibeiwang Road, Haidian District, Beijing 100193, China

Electrons can be diffracted in a standing wave of intense light, which has been first discussed by Kapitza and Dirac [1]. Theoretical evidence for electron spin effects has been given for this type of diffraction [2]. In the underlying quantum dynamics one can associate a rotation of the electron spin [3], but nevertheless the final diffraction pattern of such a process is insensitive to the initial spin configuration. Based on a numerical simulation we demonstrate that also spin-dependent diffraction as well as the generation of electron polarization is possible in two-photon Kapitza-Dirac scattering [4]. Furthermore, a refined description of spin-dependent electron diffraction can be deduced from an analytic approximation of the electron quantum state propagation matrix of the process.

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

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

[3] S. Ahrens, H. Bauke, C. H. Keitel and C. Müller, Phys. Rev. A 88, 012115 (2013).

[4] S. Ahrens, arXiv:1604.06201.