# Berlin 2014 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 32: Poster: Quantum gases, ultracold atoms and molecules

### Q 32.50: Poster

### Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

**Non-equilibrium dynamics in ion Coulomb crystals** — •Ramil Nigmatullin^{1} and Martin Plenio^{2} — ^{1}Institute of Quantum Physics, University of Ulm, Ulm, Germany — ^{2}Institute of Theoretical Physics, University of Ulm, Ulm, Germany

Recent experiments [1-3] studied the process of formation of topological defects in ion Coulomb crystals following non-equilibrium symmetry breaking phase transitions. In these experiments topological defects (kinks) were created by rapidly transforming a linear chain into a zigzag configuration. The measured scaling of the average number of defects as a function of quench rate is the first accurate measurement of the universal Kibble-Zurek scaling law in the inhomogeneous system.

Structural defects in ion Coulomb crystals are examples of discrete solitons. Discrete solitons are non-linear structures with rich complex dynamics. Ion Coulomb crystals provide an excellent platform for exploring both classical and quantum dynamics of discrete solitons. A number of recent experimental and theoretical works [4] examine the dynamics of discrete solitons in ion traps, in particular focusing on the phonon spectra, Peierls-Nabarro potential, effect of molecular ions and kink-kink interactions.

[1] - K. Pyka et al, Nature Comm. 4, 2291 (2013).

[2] - S. Ulm et al, Nature Comm. 4, 2290 (2013).

[3] - S. Ejtemaee and P. C. Haljan, Phys. Rev. A 87, 051401 (2013).

[4] - H. L. Partner et al, New J. Phys., 15 103013 (2013)