Boson Core Compressibility
arXiv:1201.0523 · doi:10.1103/PhysRevA.85.043610
Abstract
Strongly interacting atoms trapped in optical lattices can be used to explore phase diagrams of Hubbard models. Spatial inhomogeneity due to trapping typically obscures distinguishing observables. We propose that measures using boson double occupancy avoid trapping effects to reveal key correlation functions. We define a boson core compressibility and core superfluid stiffness in terms of double occupancy. We use quantum Monte Carlo on the Bose-Hubbard model to empirically show that these quantities intrinsically eliminate edge effects to reveal correlations near the trap center. The boson core compressibility offers a generally applicable tool that can be used to experimentally map out phase transitions between compressible and incompressible states.
11 pages, 11 figures
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- Critical parameters from trap-size scaling in trapped particle systems
- Scaling phenomena driven by inhomogeneous conditions at first-order quantum transitions