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Optical and Quantum Electronics

Laser-assisted phase transitions in ion Coulomb crystals in Paul traps

Anna Romanova, Yuri Rozhdestvensky

Published Apr 17, 2026• 0 citations
Publisher
DOI
10.1007/s11082-026-08815-2

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Coulomb crystals, containing up to a few hundred ions of which more than 50% were cooled sympathetically by the Coulomb interaction with laser cooled Mg+ ions, have been produced in a linear Paul trap. By controlling the balance of the radiation pressure from the two cooling lasers, the Coulomb crystals could be segregated according to ion species. Previous studies of ion crystals and molecular dynamics simulations suggest that the temperature may be around 10 mK or lower. The obtained results indicate that a wide range of atomic and molecular ions, which due to their internal structures are not amenable to direct laser cooling, can be effectively cooled and localized (crystallized) in linear Paul traps. For high resolution spectroscopy of such ions this may turn out to be very useful.