Structural phase transitions in low-dimensional ion crystals

S. Fishman, Gabriele De Chiara, T. Calarco, G. Morigi

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)


A chain of singly charged particles, confined by a harmonic potential, exhibits a sudden transition to a zigzag configuration when the radial potential reaches a critical value, depending on the particle number. This structural change is a phase transition of second order, whose order parameter is the crystal displacement from the chain axis. We study analytically the transition using Landau theory and find full agreement with numerical predictions by Schiffer [Phys. Rev. Lett. 70, 818 (1993)] and Piacente [Phys. Rev. B 69, 045324 (2004)]. Our theory allows us to determine analytically the system's behavior at the transition point.
Original languageEnglish
Article number064111
JournalPhysical Review B (Condensed Matter)
Issue number6
Publication statusPublished - 25 Feb 2008

ASJC Scopus subject areas

  • Condensed Matter Physics


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