Prof. Ralf Röhlsberger Deutsches Elektronen-Synchrotron (DESY, Hamburg)

 

Abstract: The physics of cooperative emission from atoms in cavities bears a multitude of interesting phenomena. Due to its high resonant cross section the nuclear 14.4 keV transition of 57Fe is a well-suited two-level system for such studies. This isotope was recently employed to explore superradiant emission and the collective Lamb shift for a single ultrathin layer of atoms located in an antinode of the cavity field [1].
An interesting new situation is encountered when two resonant 57Fe layers instead of one are placed in a cavity. Electromagnetically induced transparency is observed when one of the 57Fe layers is located in a node, the other one in an antinode of the standing wave in the cavity [2]. Moreover, the interaction of ensembles of resonant atoms in a cavity opens interesting perspective to observe spontaneously induced coherences. First experimental results with resonant nuclei in a cavity will be presented.

[1] R. Roehlsberger, K. Schlage, B.Sahoo, S. Couet, R.Rueffer, Science 328, 1248 (2010). 
[2] R.Roehlsberger, H. C. Wille, K. Schlage, B.Sahoo, Nature 482, 199 (2012).

Date&Time: September 14, 2012 (Friday), 16:00 – 17:00
Location: 606 Conference Room