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Effective action approach to thep-band Mott insulator and superfluid transition
Physical Review A. Atomic, Molecular, and Optical Physics
Motivated by the recent experiment on p-orbital band bosons in optical lattices, we study theoretically the quantum phases of Mott insulator and superfluidity in two-dimensions. The system features a novel superfluid phase with transversely staggered orbital current at weak interaction, and a Mott insulator phase with antiferro-orbital order at strong coupling and commensurate filling. We go beyond mean field theory and derive from a microscopic model an effective action that is capable ofdoi:10.1103/physreva.83.063626 fatcat:ojxoxzlar5h7zo5x7myzz6quuy