[5月5日]Spin effects in the Kapitza-Dirac effect

题　目：Spin effects in the Kapitza-Dirac effect
报告人：Dr. Sven Ahrens（Postdoc in Beijing Computational Science Research Center）

时　间：5月5日（周一），上午10:00-11:00
地　点➾：物理馆512会议室

报告摘要🦵🏻：

The Kapitza-Dirac effect [1], which is the diffraction of electrons at a standing wave of light, has been observed experimentally in the last decade [2]. The availability of novel high intensity X-ray laser sources calls for a relativistic description of this electron scattering process.

I discuss the quantum dynamics of the electron diffraction by solvingthe Dirac equation in momentum space [3]. Spin-effects can be found2-photon Kapitza-Dirac effect scattering as well a generalized 3-photonKapitza-Dirac effect [4]. In my talk I will focus on the occurence of the 2- and 3-photon Kapitza-Dirac effect and demonstrate, that it features a tunable electron spin-flip probability.

[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)

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

个人简介🏃🤽：

Dr. Sven Ahrens was born on Feb 23, 1983 in Erfurt of German. His research interests are photonic crystal and metamaterials as well as relativistic quantum dynamics with the Dirac equation.

*2004-2006       BSc of Science: Technische Universität Darmstadt, German

*2006-2008       Msc of Science: Technische Universität Darmstadt, German

*2008-2012       Ph.D in Physics: Ruprecht-Karls-Universität Heidelberg, German

*2012.11-2013.12  Postdoc: Max-Planck-Institut für Kernphysik

*2014.1-2014.2    Inst. Asst. Professor: Illinois State University, USA

*2014.3-present    Postdoc: Beijing Computational Science Research Center