Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.75: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Two dimensional arrays of ultra cold polar molecules: possible structural transitions — •Sofia Kantorovich1,2, Rudolf Weeber2, Christian Holm2, and Hans Peter Buechler3 — 1Ural State University, Lenin av. 51, Ekaterinburg, 620000, Russia — 2ICP, Universitaet Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Deutschland — 3ITP III, Universitaet Stuttgart, Pfaffenwaldring 57, 70550, Stuttgart, Deutschland
Polar molecules have attracted a lot of interest due to their large electric dipole moment, which in combination with external electric fields gives rise to strong dipole-dipole interactions. Recent experimental advances allowed to confine polar molecules by an optical lattice along one axes so, that a set of parallel layers is built. Each dipole moment points along the same axis, therefore, the structure within the layer is dominated by the repulsion, and the interaction between layers is mainly attractive. Here we focus on the classical regime, where the dipole-dipole interaction dominates over the kinetic contribution, and study the ground state of the array of strings of ultra cold polar molecules as a function of the ratio between intermolecular distance within one string and the separation of the strings, and showed that at a certain range one observes a structural transition from the simple square lattice to a 2D hexagonal one. Hence, by changing this ratio one can control ground state configurations, opening new possibilities for an experimental control of the ultra cold polar molecules' arrays. Quantum fluctuations can be implemented in this approach via perturbation theory.