8,588 research outputs found
Phase transitions of the q-state Potts model on multiply-laced Sierpinski gaskets
We present an exact solution of the q-state Potts model on a class of
generalized Sierpinski fractal lattices. The model is shown to possess an
ordered phase at low temperatures and a continuous transition to the high
temperature disordered phase at any q>=1. Multicriticality is observed in the
presence of a symmetry-breaking field. Exact renormalization group analysis
yields the phase diagram of the model and a complete set of critical exponents
at various transitions.Comment: 6 pages, 6 figures; figures correcte
Probing anisotropic superfluidity of rashbons in atomic Fermi gases
Motivated by the prospect of realizing a Fermi gas of K atoms with a
synthetic non-Abelian gauge field, we investigate theoretically a strongly
interacting Fermi gas in the presence of a Rashba spin-orbit coupling. As the
two-fold spin degeneracy is lifted by spin-orbit interaction, bound pairs with
mixed singlet and triplet pairings (referred to as rashbons) emerge, leading to
an anisotropic superfluid. We show that this anisotropic superfluidity can be
probed via measuring the momentum distribution and single-particle spectral
function in a trapped atomic K cloud near a Feshbach resonance.Comment: 4 pages, 5 figure
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