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SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 12: Poster I

A 12.19: Poster

Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof

Detecting the external magnetic field alignment using the vortex light atom interaction. — •Shreyas Ramakrishna1,2,3, Riaan P Schmidt4,5, Anton A Peshkov4,5, Andrey Surzhykov4,5,6, and Stephan Fritzsche1,2,31Helmholtz Institute Jena, Frobelstieg 3, D-07749 Jena, Germany — 2GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Planckstrasse 1, D-64291, Germany — 3Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat Jena, Max-Wien-Platz 1, D-07743 Jena, Germany — 4Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany — 5Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany — 6Laboratory for Emerging Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig, Germany

We analyze photoexcitation of atoms by cylindrically polarized Bessel beams in the framework of density matrix theory based on the Liouville-von Neumann equation. In particular, we study the dependence of the population of excited atomic states on the direction of the external magnetic field for the case of the (5s 2S1/2 (F=1) → 5p 2P3/2 (F=0)) electric dipole transition in 87Rb. Moreover, we demonstrate that the steady-state excited-state population is very sensitive not only to the polarization and OAM of the incoming light field, but also to the position of the atom within the beam cross-section. The results of our calculations agree well with the experimental findings of F. Castellucci et.al [Phys. Rev. Lett. 127, 233202 (2021)] and can be useful to plan future measurements.

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