Quantum Physics
Multi-Component Quantum Gases in Spin-Dependent Hexagonal Lattices
13 February 2011
Photo: AG Sengstock
In solid state materials hexagonal structures play an extremely important role and lead to novel physics like that of carbon nanotubes or graphene. We have for the first time realized a sample of ultracold atoms in a spin-dependent optical lattice with hexagonal symmetry. We show that combined effects of the lattice and interactions between atoms lead to a forced antiferromagnetic Néel order. We could also demonstrate that the coexistence of two components – one Mott-insulating and the other one superfluid – leads to the formation of a forced supersolid.