Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.30: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Towards gauge fields and topological states with ultracold erbium atoms — •Roberto Vittorio Röll, Daniel Babik, Carl Cheung, Jens Ulitzsch, and Martin Weitz — Institut für Angwandte Physik, Universität Bonn
We report on progress in an ongoing experiment directed at the observation of topological states of ultracold erbium atoms in a 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 with atomic erbium in spin-dependent optical lattice experiments and for far detuned Raman manipulation in comparison with the usual alkali atoms.
In our Bonn experiment an atomic erbium Bose-Einstein condensate (BEC) is generated in a quasistatic optical dipole trap provided by a focused mid-infrared CO2-laser beam. In the next experimental step, we plan to realize synthetic magnetic fields by phase imprinting with Raman manipulation beams. The goal is to observe fractional quantum Hall physics for atoms in a strong synthetic magnetic field.