Superfluidity and interference pattern of ultracold bosons in optical lattices
Superfluidity and interference pattern of ultracold bosons in optical lattices
We present a study of the superfluid properties of atomic Bose gases in optical lattice potentials using the Bose-Hubbard model. To do this, we use a microscopic definition of the superfluid fraction based on the response of the system to a phase variation imposed by means of twisted boundary conditions. …