Mag. Michael Gröbner, PhDPostdocTechnikerstrasse 25/4 A6020 Innsbruck, Austria, Europe Tel: +43 512 507  52426 (Office) or  52532 (Lab) Fax: +43 512 507  52499 Email: 
Michael Gröbner was born on 21^{th} April 1988 in Innsbruck, Austria. After receiving Matura, he attended the military service and started to study physics at the University of Innsbruck. In 2013, he finished his Master thesis under the supervision of Prof. H.C. Nägerl and joined as a PhD student in the newly founded PoCeMoN (Ultracold Potassium  Cesium Molecules) team. Based on the results of his master thesis he developed a new quantum gas apparatus that allows for the first time the study of ultracold mixtures of bosonic/fermionic potassium and cesium. The research was focused on the simultaneous creation of degenerate samples of ^{39}K and ^{133}Cs, the observation of interspecies Feshbach resonances to obtain precise knowledge of the scattering properties and the improvement of cooling techniques that resulted in the coldest K samples after laser cooling. During this time, he was also involved in teaching classes for the physics program of the University of Innsbruck. In 2017, he received his PhD and at the same time finished his secondary teacher education (Lehramtsstudium) in physics and mathematics. Subsequently, he decided to stay as a postdoctoral fellow within the research group of Prof. H.C. Nägerl and to extend his doctoral work. Michael's research interests are now primarily based on the creation of heteronuclear molecules and the observation of exotic quantum phases in nontrivial lattice geometries. 
2017  present  Postdoc at the PoCeMoN (Ultracold Potassium  Cesium Molecules) and the CsIII (A second generation Cs BoseEinstein condensation experiment) experiment in the group of Prof. H.C. Nägerl 
2013  2017  PhD student at the PoCeMoN (Ultracold Potassium  Cesium Molecules) experiment in the group of Prof. H.C. Nägerl. Thesis topic: Development of a new quantum gas apparatus for ultracold mixtures of K and Cs 
2011  2013  Master Thesis in the group of R. Grimm under supervision of Prof. H.C. Nägerl: "Aufbau und Charakterisierung eines Lasersystems zum Kühlen und Fangen von Kaliumatomen" at the CsIII experiment 
2007  2013  Study of physics at the LeopoldFranzensUniversität Innsbruck 
2010  2017  Secondary teacher education (Lehramtsstudium) in physics and mathematics at the LeopoldFranzensUniversität Innsbruck. Diploma thesis: "BoseEinsteinKondensation im Schulunterricht" 

Observation of interspecies Feshbach resonances in an ultracold ^{39}K^{133}Cs mixture and refinement of interaction potentialsM. Gröbner, P. Weinmann, E. Kirilov, H.C. Nägerl, P. S. Julienne, C. R. Le Sueur, and J. M. Hutson We observe interspecies Feshbach resonances due to swave bound states in ultracold ^{39}K^{133}Cs scattering for three different spin mixtures. The resonances are observed as joint atom loss and heating of the K sample. We perform leastsquares fits to obtain improved KCs interaction potentials that reproduce the observed resonances, and carry out coupledchannel calculations to characterize the scattering and boundstate properties for ^{39}KCs, ^{40}KCs and ^{41}KCs. Our results open up the possibilities of tuning interactions in KCs atomic mixtures and of producing ultracold KCs molecules. 

Degenerate Raman sideband cooling of ^{39}KM. Gröbner, P. Weinmann, E. Kirilov, and H.C. Nägerl We report on a first realization of subDoppler laser cooling of ^{39}K atoms using degenerate threedimensional Raman sideband cooling. We take advantage of the wellresolved excited hyperfine states on the D_{1} optical transition to produce spin polarized samples with 1.4x10^{8} atoms at temperatures of 1.8 μK. The phasespace densities are ≥10^{4}, which significantly improves the initial conditions for a subsequent evaporative cooling step. The presented cooling technique using the D_{1} line can be adapted to other atomic species and is applicable to highresolution imaging schemes in far offresonant optical lattices. 

Observation of manybody longrange tunneling after a quantum quenchF. Meinert, M. J. Mark, E. Kirilov, K. Lauber, P. Weinmann, M. Gröbner, A. J. Daley, and H.C. Nägerl Quantum tunneling is at the heart of many lowtemperature phenomena. In strongly correlated lattice systems, tunneling is responsible for inducing effective interactions, and longrange tunneling substantially alters manybody properties in and out of equilibrium. We observe resonantly enhanced longrange quantum tunneling in onedimensional Mottinsulating Hubbard chains that are suddenly quenched into a tilted configuration. Higherorder tunneling processes over up to five lattice sites are observed as resonances in the number of doubly occupied sites when the tilt per site is tuned to integer fractions of the Mott gap. This forms a basis for a controlled study of manybody dynamics driven by higherorder tunneling and demonstrates that when some degrees of freedom are frozen out, phenomena that are driven by smallamplitude tunneling terms can still be observed. 