Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg
Tel: 06221/ 54 19471
Fax: 06221/ 54 19545
Quantum dynamics of atomic and molecular systems
Our group studies atomic and molecular quantum systems with respect to their interactions on different levels of complexity. Of special importance is the application and extension of modern methods for the manipulation and quantum control to manybody quantum systems, in particular using coherent light. The systems under investigation range from highly excited Rydberg atoms over atomic and molecular quantum gases to molecular aggregates. The group develops technologies for trapping and cooling of neutral atoms as well as quantumstate sensitive diagnostics.
Latest news from the lab
Tests of universality in the heteronuclear Efimov scenario  16.02.2016 
Universal phenomena do not depend on the details of the underlying twobody potential or the type of interaction, and therefore can be found in various areas of modern quantum physics. A prototypical example is the Efimov scenario, where three resonantly interacting particles, be it elementary particles or neutral atoms, can bind into threebody bound states with an energy spectrum that follows an infinite geometrical progression, or in more general terms – the trimers exhibit a discrete scaling symmetry. The analysis of our data, which was performed in close collaboration with colleagues from Paris, France, revealed the existence of such universal scaling. At the same time, strong indications of nonuniversality due to residual van der Waals interaction could also be observed. This knowledge will be crucial for the further investigation of manybody properties of quantum matter in extreme conditions and could shed light on the structure of very different fewbody systems.

Reference: Universal threebody recombination and Efimov resonances in an ultracold LiCs mixture, Phys. Rev. A 93, 022707 (2016), or see our full list of publications 
Juris Ulmanis obtains his PhD  28.11.2015 
After a sucessfull thesis defense Juris Ulmanis from the Mixtures team obtains his PhD degree. Congratulations!

Reference: Universality and nonuniversality in the heteronuclear Efimov scenario with large mass imbalance, PhD thesis, or see our full list of publications 
Three photon offresonant excitation of Rybderg nP> states  12.06.2015 
The first step of the excitation is done via a circularly polarized 780 nm beam, red detuned by 100 MHz from the ground to excited transition, then a circularly polarized 480 nm laser is used to get 100 MHz below a Rydberg nS> state. Finally the Rydberg nP> state is excited by applying a microwave radiation pulse, appropriately tuned to compensate for the detuning of the previous two steps. We apply a small magnetic field to remove the Zeeman degeneracy and to address a well defined Zeeman substate.

Reference: Observing the Dynamics of DipoleMediated Energy Transport by Interaction Enhanced Imaging, Science 342, 954 (2013), or see our full list of publications 