Postdoctoral fellow and Ph.D. student positions in experimental cold atoms & cold molecules research
Institute for Experimental Physics, Heinrich-Heine-Universität Düsseldorf
March 9, 2018
19000.00 - 77000.00
Physics: Atomic and Molecular, Physics: Instrumentation and Measurement, Physics: Optics and Laser
In two projects, we offer both post-doctoral positions and Ph.D. student positions. Both are for duration of up to 5 years.
1) Optical atomic clocks and application to fundamental physics and relativistic geodesy
The work concerns the further development and the application of a transportable optical atomic clock based on lattice trapped Strontium atoms.
Our optical lattice clock is a relatively unique device in that is has both high performance and transportability. It has reached an inaccuracy of 2 x 10^-17 [S. Origlia et al, arxiv 1803.03157]. The performance shall be further improved and its subsystems made more robust. This work will take place at PTB Braunschweig in cooperation with groups there, as well as with a team at the Univ. of Birmingham.
Subsequently, the clock shall be transported to locations of interest in order to perform measurements of the gravitational potential of the Earth. A first set of measurements shall be performed by comparing the transportable clock via high-accuracy fiber-optical links with other clocks in national metrology laboratories. A first such experiment could take place in the Laboratoire Souterain de Modane in the Alps.
A second set of measurements shall be performed in the framework of the ACES mission of ESA. Here, an atomic clock on the ISS will allow comparison of ground clocks world-wide. For this purpose, the clock shall be equipped with a microwave terminal and shall be operated for some time at a distant location, e.g. South America.
It is also intended to use the clock to perform laboratory tests of fundamental physics, e.g. search for new forces in nature.
The post-doc position will allow the applicant to play a leading role in the development and application of the clock.
2 Ph.D. students positions are available to become part of the team.
Two Ph.D. students are already currently engaged on the apparatus and its subsystems.
2) High-resolution spectroscopy of cold trapped molecular hydrogen ions and application to fundamental physics
In this project, the Post-doc/Ph.D. student will explore precision vibrational spectroscopy of the molecular ions HD+ and H2+ with the goals of testing QED theory in molecules and determining fundamental constants.
These molecular ions are trapped in an ion trap and laser-cooled. In this state it is possible to perform spectroscopy with ultra-high (1 x 10^-9 and better) resolution, accuracy at the same level and better. It it thus possible to measure fundamental constants, e.g. the mass of the proton. For our recent results, see: arXiv:1802.03208 (Nature Physics, to appear).
Two working apparata are available. The tasks consists in improving the automatization of the apparata, the trapped ion control and read-out, integrating the apparatus with spectroscopy lasers, develop the techniques to control the lasers so that the spectroscopy can be performed, take data, and analyze it.
Theoretical support on the physics of molecular ions is available.
For references on this topic, see the group's website:
The post-doc position will allow the person to play a leading role in the development of the experiments.
2 Ph.D. student positions are available to become part of the team.
Four Ph.D. students are already currently engaged on the experiments.
Travel expenses for expeditions will be covered.
Additional Salary Information: Post-doc: approximate Gross salary in Euro: 64,000 p.a.
Ph.D. student: 16,000 - 24,000 net in Euro, depending on qualifications
About Institute for Experimental Physics, Heinrich-Heine-Universität Düsseldorf
The University of Düsseldorf is located in the capital of the most populous state in Germany, North-Rhine Westfalia. It covers all sciences and humanities, as well as medicine, in both research and teaching.
The Institute for Experimental Physics is devoted to research in quantum optics and applications to fundamental physics, such as atomic clocks, tests of symmetries, measurement of fundamental constants.