Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.9: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1

Quantum phases of ultracold dipolar molecules in low dimensions — Florian Cartarius^1,2, •Lukas Himbert¹, Anna Minguzzi², and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany — ²Université Grenoble-Alpes, CNRS, LPMMC, BP166, 38042 Grenoble, France

We consider ultracold dipolar bosonic molecules in a 1D optical lattice in tight anisotropic harmonic confinement, leading to a quasi one-dimensional geometry. If the confinement along one of the directions perpendicular to the optical lattice is relaxed, the system undergoes a structural linear-zigzag transition. We show that close to the transition this system can be mapped onto a multi-orbital extended Bose-Hubbard model, where the coefficients can be determined by means of a low-energy theory. The system displays a rich phase diagram resulting from the interplay between tunneling, on-site repulsion, the external confinement and dipolar interaction and we determine the ground state at the linear-zigzag structural instability by means of exact diagonalization. This study sets the basis for a systematic investigation on the interplay between structural and quantum order in interacting quantum gases.