Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Ultra-cold atoms, ions and BEC (with Q)

A 9.15: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Species and regime trade-off of atomic sources for extended-time atom interferometry — •Sina Loriani, Dennis Schlippert, Christian Schubert, Ernst Maria Rasel, and Naceur Gaaloul — Leibniz University of Hanover, Germany

Recent proposals for space-borne atomic sensors designed to detect gravitational waves or testing the universality of free fall predict unprecedented sensitivity for long interrogation times. These extremely long drift times of several seconds are possible thanks to the collimation technique of delta-kick cooling (DKC) [Müntinga, et al. Phys. Rev. Lett. 110, 093602 (2013), T. Kovachy et al., Phys. Rev. Lett. 114, 143004 (2015)]. These atomic lenses are, however, subject to aberrations depending on the extent of the collimated wave packets and the potentials used. In this theoretical study, we trade-off the performance of the DKC for commonly used alkaline and alkaline-earth-like ensembles of atoms (Rb, Sr, Yb, etc.) in the metrology context. The efficiency of the DKC is evaluated and contrasted for these isotopes in the three possible density regimes (thermal, hydrodynamic and degenerate). The expansion dynamics is followed by solving different scaling law approaches depending on the temperature and density of the considered atomic cloud. The results show a clear advantage when using condensed or hydrodynamic ensembles.