Physical Review Letters · 2001 · 145 citations · 20 references
Materials ScienceCrystal StructureInner Cylindrical CrystalEngineeringPhysicsLinear Paul TrapCrystal MaterialApplied PhysicsQuantum MaterialsCondensed Matter PhysicsAtomic PhysicsLinear Paul TrapsOptical TrappingTwo-component Coulomb CrystalsElectronic StructureCrystallographySolid-state PhysicIon Structure
We report on structural properties of two-component Coulomb crystals in a linear Paul trap. The crystals consist of two laser cooled ion species, 24Mg+ and 40Ca+. The lighter 24Mg+ ions form an inner cylindrical crystal structure surprisingly similar to that of an infinitely long single component crystal, while the outermost shell of the surrounding 40Ca+ ions have a spheroidal shape, which is highly insensitive to the presence of the 24Mg+ ions. Observed changes in the radial separation of the two ion species with the radius of the inner cylindrical crystal is explained by a simple model.
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