Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Gases: Interaction Effects II
Q 31.7: Talk
Wednesday, March 10, 2010, 15:30–15:45, E 001
Ultracold dipoles on a ring — •Sascha Zöllner1, Georg M. Bruun2, and Stephanie M. Reimann2 — 1Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen, Denmark — 2Mathematical Physics, LTH, Lund University, 2100 Lund, Sweden
Dipolar bosons and fermions in a quasi-one-dimensional (1D) ring potential have the interesting feature of combining the physics of 1D gases with anisotropic effects. Depending on the orientation of their dipole moments and the dipolar interaction strength, there may be a competition between repulsive and attractive regions on the ring. We identify three basic phases based on simulations in a few-body system:
(i) a repulsive regime resembling an inhomogeneous 1D Bose (Fermi) gas,
(ii) a Wigner-crystal-like state with a non-equidistant spatial distribution, and
(iii) bound states of identical bosons (fermions) localized in the strongly attractive regions on the ring.
We discuss how these states arise in a crossover from weak to strong dipolar interactions, with an emphasis on the particle-number dependence.