Quantum stripe ordering in optical lattices.
We predict the robust existence of a novel quantum orbital stripe order in the p-band Bose-Hubbard model of two-dimensional triangular optical lattices with cold bosonic atoms. An orbital angular momentum moment is formed on each site exhibiting a stripe order both in the superfluid and Mott-insulating phases. The stripe order spontaneously breaks time-reversal, lattice translation, and rotation symmetries. In addition, it induces staggered plaquette bond currents in the superfluid phase. Possible signatures of this stripe order in the time of flight experiment are discussed.
Wu
Congjun
C
Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA.
Liu
W Vincent
WV
Moore
Joel
J
Sarma
Sankar Das
SD