Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Gases (Bosons and Fermions) II

Q 60.6: Vortrag

Freitag, 15. März 2019, 12:00–12:15, S HS 037 Informatik

Towards quantum Hall physics with ultracold erbium atoms — •Roberto Röll, Cecilien Harnik, David Helten, Daniel Babik, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Deutschland

We report on progress in an ongoing experiment directed at the observation of fractional quantum Hall physics in an integer spin system, using ultracold erbium atoms in a strong synthetic magnetic gauge field.

In alkali atoms with their S-ground state configuration in far detuned laser fields with detuning above the upper state fine structure splitting the trapping potential is determined by the scalar electronic polarizability. In contrast, for an atomic erbium quantum gas with its L > 0 electronic ground state, the trapping potential for inner-shell transitions also for far detuned dissipation-less trapping laser fields becomes dependent on the internal atomic state (i.e. spin). Therefore it is expected to reach much longer coherence times in the erbium species with L > 0 which will allow for large light-induced magnetic fields in comparison with the usual alkali atoms.

In our Bonn experiment an atomic erbium Bose-Einstein condensate (BEC) is generated in a crossed quasistatic optical dipole trap provided by a focused mid-infrared CO2-laser beam as well as a YAG-laser beam. In the next experimental step, we plan to realize synthetic magnetic fields by phase imprinting with Raman manipulation beams.