Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-09-20
Phys. Rev. Lett. 106, 105302 (2011)
Physics
Condensed Matter
Quantum Gases
4 pages, 2 figures
Scientific paper
We study the phase diagram of repulsively interacting spin-1 bosons in optical lattices at unit filling, showing that an externally induced quadratic Zeeman effect may lead to a rich physics characterized by various phases and phase transitions. We find that the main properties of the system may be described by an effective field model, which provides the precise location of the phase boundaries for any dimension, being in excellent agreement with our numerical calculations for one-dimensional systems. Our work provides a quantitative guide for the experimental analysis of various types of field-induced quantum phase transitions in spin-1 lattice bosons. These transitions, which are precluded in spin-1/2 systems, may be realized using an externally modified quadratic Zeeman coupling, similar to recent experiments with spinor condensates in the continuum.
Arguelles Arturo
Kolezhuk Alexei K.
Rodriguez Karen
Santos Laércio
Vekua Temo
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