Superfluidity of Paired Bosons from Correlated Tunneling

摘要

We study superfluidity of paired Bosonic atoms in optical lattices.The atoms have strong repulsive on-siteenergy.Single atom tunneling is severely suppressed while the atom-pair may co-tunnel by the second order quantumtransition,which induces paired superfluidity as repulsive nearest-neighbor interactions are included.The mean-fieldphase diagram and low energy excitations are explored for a square lattice system.