# Hannover 2013 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 45: Atomic systems in external fields I

### A 45.5: Vortrag

### Freitag, 22. März 2013, 12:15–12:30, B 302

**Bessel beams of laser-driven two-level atoms** — •Armen Hayrapetyan^{1}, Oliver Matula^{1,2}, Andrey Surzhykov^{1,2}, and Stephan Fritzsche^{2,3} — ^{1}Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany — ^{2}Gesellschaft für Schwerionenforschung (GSI), D-64291, Darmstadt, Germany — ^{3}Department of Physics, P.O., Box 3000, Fin-90014 University of Oulu, Finland

We study Bessel beams of two-level atoms that are driven by the linearly polarized laser field. For such laser-driven two-level atoms, we obtain exact, Bessel-type solutions of the time-dependent Schrödinger equation that describes the dynamics of the atom-laser system beyond the typical paraxial approximation. We show that the probability density and the current of these atomic beams obtain non-trivial, Bessel-type behavior and can be tuned under the special choice of the atom and laser parameters, such as the nuclear charge, atom velocity, laser frequency and the propagation geometry of the atom and laser beams. In crossed-beam scenario, moreover, we show that both the probability density and the current of Bessel beams of different atoms acquire different time-dependency. Whereas, in collinear-beam scenario, the probability density and current of these atomic beams do not depend on time. Bessel beams of atoms are of interest to re-investigate atomic collisions, recombination processes or the generation of entanglement in atomic beams.