Andreas Schindewolf

Andreas Schindewolf

PhD Student

Technikerstrasse 25

A-6020 Innsbruck, Austria, Europe

Tel: +43 512 507 - 52431 (Office) or - 52445 (Lab)

Fax: +43 512 507 - 52499




RbCs - Ultracold polar molecules (H.-C. Nägerl)


Physics at TU München, external Diplomathesis at University of Strathclyde, Glasgow (Prof. S. Kuhr)

Research Highlights


Quantum engineering of a low-entropy gas of heteronuclear bosonic molecules in an optical lattice

L. Reichsöllner*, A. Schindewolf*, T. Takekoshi, R. Grimm, and H.-C. Nägerl

*These authors contributed equally to this work.

We demonstrate a generally applicable technique for mixing two-species quantum degenerate bosonic samples in the presence of an optical lattice, and we employ it to produce low-entropy samples of ultracold 87Rb133Cs Feshbach molecules with a lattice filling fraction exceeding 30%. Starting from two spatially separated Bose-Einstein condensates of Rb and Cs atoms, Rb-Cs atom pairs are efficiently produced by using the superfluid-to-Mott insulator quantum phase transition twice, first for the Cs sample, then for the Rb sample, after nulling the Rb-Cs interaction at a Feshbach resonance's zero crossing. We form molecules out of atom pairs and characterize the mixing process in terms of sample overlap and mixing speed. The dense and ultracold sample of more than 5000 RbCs molecules is an ideal starting point for experiments in the context of quantum many-body physics with long-range dipolar interactions.

Phys. Rev. Lett. 118, 073201 (2017), arXiv:1607.06536



Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state

T. Takekoshi, L. Reichsöllner, A. Schindewolf, J. M. Hutson, C. R. Le Sueur, O. Dulieu, F. Ferlaino, R. Grimm, H.-C. Nägerl

We produce ultracold dense trapped samples of 87Rb133Cs molecules in their rovibrational ground state, with full nuclear hyperfine state control, by stimulated Raman adiabatic passage (STIRAP) with efficiencies of 90%. We observe the onset of hyperfine-changing collisions when the magnetic field is ramped so that the molecules are no longer in the hyperfine ground state. A strong quadratic shift of the transition frequencies as a function of applied electric field shows the strongly dipolar character of the RbCs ground-state molecule. Our results open up the prospect of realizing stable bosonic dipolar quantum gases with ultracold molecules.

Phys. Rev. Lett. 113, 205301 (2014) , arXiv:1405.6037



see publications of our research group