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Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quanteneffekte: QED

Q 4.4: Vortrag

Montag, 12. März 2012, 11:15–11:30, V7.01

Quantum electron self-interaction in a strong laser field — •Sebastian Meuren and Antonino Di Piazza — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg

The quantum states of an electron in a plane-wave field are known as Volkov states [1]. In [2] we have calculated the electron states in a plane wave by including at leading order the effects of the interaction of the electron with its own electromagnetic field (self interaction) by solving the Schwinger-Dirac equation in the presence of an arbitrary linearly-polarized plane-wave field (see Ref. [3]). The expression of the modified Volkov states first shows that self-effects lead to quantum modifications of the electron quasi-momentum in a monochromatic plane-wave. They are qualitatively different from the well known classical part of the quasi-momentum which can be understood from the quivering motion of the electron. Moreover, we have shown that the spin dynamics of the electron is significantly altered by taking the self-interaction into account. We have indicated that an electron initially prepared in a definite spin state may undergo a spin-flip while passing through a strong laser field only due to the interaction with its own electromagnetic field and even if it does not radiate photons.
[1] V. B. Berestetskii, E. M. Lifshitz, and L. P. Pitaevskii, Quantum Electrodynamics, (Elsevier, Amsterdam, 1982)
S. Meuren and A. Di Piazza, Phys. Rev. Lett., in press.
V. I. Ritus, J. Sov. Laser Res. 6, 497 (1985).

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