have especially concentrated on the strongly interacting or unitarity limit exactly at resonance where the attraction between the atoms is as large as quantum mechanics allows. Again, the group of H.T.C. Stoof made important contributions to this topic. For example, they were first to predict the topology of the universal phase diagram of this unitarity gas, that is now confirmed by the experiments and that contains a tricritical temperature below which the gas phase separates between an (almost) equal density superfluid and a polarized normal gas. Making use of renormalization group techniques, they are up to now the only theoretical group that has been able to accurately calculate this strong-coupling tricritical temperature from first principles. They believe that an important reason for the success in this area of physics is that they have a background in both the microscopic atomic physics and in the macroscopic condensed-matter physics. It is only through a combination of this knowledge that one can arrive at sophisticated many-body theories that can be directly compared with experiment without any fitting parameters. External links Homepage H.T.C. Stoof 1962 births Living people 21st-century Dutch physicists Academic staff of Utrecht University Eindhoven University of Technology alumni People from Veldhoven