Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 13: Fundamentals

A 13.4: Vortrag

Montag, 5. März 2018, 17:30–17:45, K 1.011

Spin nonconservation in Compton scattering — •Sven Ahrens and Chang-Pu Sun — Beijing Computational Science Research Center Building 9, East Zone, ZPark II, No.10 East Xibeiwang Road, Haidian District, Beijing 100193, China

Spin effects of diffracted electrons in standing light waves opens the question, on whether the dynamics might be determined by selection rules based on spin conservation [1]. To answer this question, we investigate the simplest possible system (an electron interacting with a single photon field) and investigate the corresponding S-matrix for the case of 180 degree back scattering of the photon [2]. We construct a scenario with specific incoming and outgoing particle momenta, in which it becomes clear that the combined spin (intrinsic angular momentum) of the photon and electron is not conserved, when comparing before and after their interaction. We also show the angle resolved behavior of electron and photon spin and discuss the establishment of spin entanglement between the outgoing particles.

[1] D. L. Freimund and H. Batelaan, Laser Phys. 13, 892 (2003).

[2] arXiv:1708.09606 (accepted, to appear in Phys. Rev. A)