Multi-orbital and density-induced tunneling of bosons in optical lattices
Multi-orbital and density-induced tunneling of bosons in optical lattices
We show that multi-orbital and density-induced tunneling have a significant impact on the phase diagram of bosonic atoms in optical lattices. Off-site interactions lead to density-induced hopping, the so-called bond-charge interactions, which can be identified with an effective tunneling potential and can reach the same order of magnitude as conventional …