Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Ultra-cold atoms, ions and BEC IV (with A)

Q 55.2: Vortrag

Donnerstag, 3. März 2016, 14:45–15:00, f303

Quantum phases of ultracold dipolar bosons in a highly anisotropic trap — •Florian Cartarius^1,2, Anna Minguzzi², and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany — ²Laboratoire de Physique et Modelisation des Milieux Condenses, Universite-Grenoble Alpes and CNRS, 25 avenue des martyrs, F-38042 Grenoble, France

We study two dimensional dipolar bosons in an optical lattice, tightly confined to a string by a highly anisotropic harmonic potential. The bosons are polarized perpendicular to the plane by an external field, so that they interact via the repulsive part of the dipolar potential. For very strong harmonic confinements, the dipoles are in the lowest energy state of the transverse harmonic oscillator. This breaks down when the transverse confinement frequency is decreased below a critical value. In this regime, we show that the system can be mapped onto several coupled extended Bose-Hubbard Hamiltonians, where the coefficients can be determined by means of a low energy theory [1]. We determine the ground state of this Bose-Hubbard Hamiltonian as a function of the trap aspect ratio and of the strength of the dipolar potential, and analyse the conditions under which Haldane-like phases and pair-superfluidity can occur.

[1] F. Cartarius, G. Morigi, and A. Minguzzi, Phys. Rev. A 90, 053601 (2014)