PhD, Master, and Bachelor Positions available, feel free to contact Prof. Ernst Rasel.
QUANTUS-1: Interferometry with ultra-cold gases in microgravity (PhD-Position)
Within the QUANTUS collaboration led by Prof. Dr. Ernst M. Rasel the first Bose-Einstein condensate (BEC) in microgravity [Science 328 (5985): 1540-1543] and first atom interferometric measurements with BECs in microgravity [Phys. Rev. Lett. 110, 093602 (2013)] have been demonstrated. Those measurements have been conducted during the free fall of the scientific apparatus QUANTUS-1 operated at the drop tower Bremen. To increase the sensitivity of the BEC interferometer, new interferometer topologies and beam splitter techniques, like large momentum transfer beam splitters will be investigated. Another aspect of the research within QUANTUS-1 is the further reduction of the kinetic energy of the atomic ensemble by applying magnetic or optical lenses to reduce the expansion rate of the ensemble and to reach sub nanokelvin temperatures. These developments will pave the way for future satellite missions as proposed e.g. in STE-QUEST.
QUANTUS-2: Interferometry with ultra-cold mixtures in microgravity (PhD position)
Within the QUANTUS collaboration, a high-resolution interferometer employing an atom chip for generating Bose-Einstein condensates (BEC) of Rubidium is currently prepared for first experiments in the catapult of the drop tower Bremen. This new apparatus [Microgravity Sci. Technol. 23, 3, 287-292 (2011) ] can produce BECs of 105 87Rb-atoms within one second, which makes it one of the fastest BEC machines. The design builds on the pioneering experiments in the drop tower demonstrating BECs and BEC interferometry. With a total free fall duration of up to nine seconds the catapult provides the means to extend the interferometer over up to now inaccessible time scales. This shall be exploited to perform a quantum test of Einsteins equivalence principle with unprecedented sensitivity with ultra-cold ensembles of Rubidium and potassium atoms. This will pave the way for future satellite missions as proposed e.g. in STE-QUEST.
MAIUS-1: Interferometry with ultra-cold gases in space (PhD position)
Within the microgravity program of DLR the QUANTUS cooperation will demonstrate the operation of a dual species Interferometer with Bose-Einstein condensates in space. The miniaturized atom-chip based device will be carried by a sounding rocket providing six minutes of free fall under microgravity conditions for demonstrating the autonomous operation of the Bose-Einstein condensate source and an atom interferometer. The experiments will build on a first rocket test using rubidium only. Consecutively two further missions in 2017 and 2018 are planned. Within MAIUS-2 dual species mixtures will be investigated in space by adding potassium to the system. In MAIUS-3 this dual species source will be used to perform a simultaneous measurement on both species to test Einstein’s equivalence principle. These developments will pave the way for future satellite missions as proposed e.g. in STE-QUEST.