Quantum Stripe Ordering in Optical Lattices
2006; American Physical Society; Volume: 97; Issue: 19 Linguagem: Inglês
10.1103/physrevlett.97.190406
ISSN1092-0145
AutoresCongjun Wu, W. Vincent Liu, Joel E. Moore, S. Das Sarma,
Tópico(s)Spectroscopy and Laser Applications
ResumoWe 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.
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