Bremen 2017 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 8: Experimentelle Tests 1
GR 8.4: Vortrag
Mittwoch, 15. März 2017, 10:10–10:30, SFG 0140
Atom-chip gravimetry with Bose-Einstein condensates — •Martina Gebbe1, Sven Abend2, Matthias Gersemann2, Hauke Müntinga1, Holger Ahlers2, Wolfgang Ertmer2, Ernst M. Rasel2, Claus Lämmerzahl1, and The QUANTUS Team1,2,3,4,5,6 — 1ZARM, Uni Bremen — 2Institut für Quantenoptik, LU Hannover — 3Institut für Physik, HU Berlin — 4Institut für Quantenoptik, Uni Ulm — 5Institut für angewandte Physik, TU Darmstadt — 6Institut für Physik, JGU Mainz
Due to their small spatial and momentum width ultracold Bose-Einstein condensates (BEC) or even delta-kick collimated (DKC) atomic ensembles are very well suited for high precision atom interferometry. We generate such an ensemble in a miniaturized atom-chip setup where BEC generation and delta-kick collimation can be performed in a fast and reliable way. Using the chip as retroreflector we have realized a compact gravimeter and determined local gravitational acceleration g with an accuracy of 10−5 g limited by seismic noise. We demonstrate that the device’s sensitivity can be enhanced with the help of an optical lattice to relaunch the atoms. Our atom-chip gravimeter opens up the way for compact and robust portable sensors that are interesting for various applications. This work is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) due to an enactment of the German Bundestag under grant numbers DLR 50WM1552-1557 (QUANTUS-IV-Fallturm).