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Structural Phase Transitions for Confined Ions

Event Details

Event Dates: 

Tuesday, October 10, 2017 - 4:00pm

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Shmuel Fishman

Speaker Affiliation(s): 

Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

Crystals consisting of ions may be formed as a result of the application of a confining potential. Phase transitions in such crystals result from  the competition between the confining potential and the repulsion between the ions. In one dimension, at zero temperature, at such a transition a zigzag forms. The quantum effects are described by the Ising model in a transverse field. Two-dimensional structures undergo a buckling instability described by a rich phase diagram. The system is modeled by the six state clock model, exhibiting a Kosterlitz-Thouless transition and quasi-long-range order at finite temperatures as well as a transition to quantum long-range order. The models to be presented provide an  idealized  description for experiments on cold atoms. In the seminar joint work in collaboration with Daniel Podolsky, Efrat Shishoni and Giovanna Morigi will be reported.