Title: Cool Physics with Ion Coulomb Crystals Speaker: Michael Drewsen, IFA Time: Thursday, May 6, 15.15 to 16.00 Place: Fys Aud Abstract: When ions with the same sign of charge are cooled into the mK-range under normal trapping conditions, they form spatially ordered structures, often referred to as ion Coulomb crystals. The low temperatures needed for crystallization can rather easily be reached when the trapped ions can be laser cooled. Other ion species can, however, as well become part of a crystalline structure through Coulomb interactions with simultaneously trapped laser-cooled ions. The properties of Coulomb crystals strongly deviate from usual solids since the individual ions are behaving essentially like their free counterparts while staying localized on the nanometer-scale in the spatially ordered structure. These and other more specific properties depending on controllable parameters such as the exact form of the trapping potential, the number of ions, the charge state and the masses of the ions make Coulomb crystals suitable for an extremely wide range of applications within AMO science. In the talk, I will review a series of results obtained with ion Coulomb crystals in the Ion Trap Group in recent years, as well as discuss potential AMO applications of such crystals in the future. Peter Staanum and Nicolai Nygaard