Quantum magnetism and counterflow supersolidity of up-down bosonic dipoles

Abstract

We study a gas of dipolar Bosons confined in a two-dimensional optical lattice. Dipoles are considered to point freely in both up and down directions perpendicular to the lattice plane. This results in a nearest neighbor repulsive (attractive) interaction for aligned (anti-aligned) dipoles. We find regions of parameters where the ground state of the system exhibits insulating phases with ferromagnetic or anti-ferromagnetic ordering, as well as with rational values of the average magnetization. Evidence for the existence of a novel counterflow supersolid quantum phase is also presented.

8 pages, 6 figures

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• Far from equilibrium quantum magnetism with ultracold polar molecules
• d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules
• Long-range and frustrated spin-spin interactions in crystals of cold polar molecules
• Synchronization transition in dipole-coupled two-level systems with positional disorder
• Detecting paired and counterflow superfluidity via dipole oscillations
• Bose-Einstein Condensation and Many-Body Localization of Rotational Excitations of Polar Molecules
• Tunable exciton interactions in optical lattices with polar molecules
• Quantum phases of dipolar rotors on two-dimensional lattices
• Spin supersolid phase in coupled alternating spin chains
• Non-adiabatic control of quantum energy transfer in ordered and disordered arrays
• Anomalous supersolidity in a weakly interacting dipolar Bose mixture on a square lattice
• Spin Waves and Dielectric Softening of Polar Molecule Condensates