paper

Sliding Phases in XY-Models, Crystals, and Cationic Lipid-DNA Complexes

arXiv:cond-mat/9904415 · doi:10.1103/PhysRevLett.83.2745

Abstract

We predict the existence of a totally new class of phases in weakly coupled, three-dimensional stacks of two-dimensional (2D) XY-models. These ``sliding phases'' behave essentially like decoupled, independent 2D XY-models with precisely zero free energy cost associated with rotating spins in one layer relative to those in neighboring layers. As a result, the two-point spin correlation function decays algebraically with in-plane separation. Our results, which contradict past studies because we include higher-gradient couplings between layers, also apply to crystals and may explain recently observed behavior in cationic lipid-DNA complexes.

4 pages of double column text in REVTEX format and 1 postscript figure

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