Sliding Phases in Models, Crystals, and Cationic Lipid-DNA Complexes
We predict the existence of a new class of phases in weakly coupled, three-dimensional
stacks of two-dimensional (2D) XY models. These “sliding phases” behave like decoupled,
independent 2D XY models with zero free-energy cost for macroscopic relative rotation of
spins in different layers and algebraic decay of two-point spin correlation functions 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 …
stacks of two-dimensional (2D) XY models. These “sliding phases” behave like decoupled,
independent 2D XY models with zero free-energy cost for macroscopic relative rotation of
spins in different layers and algebraic decay of two-point spin correlation functions 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 …
Abstract
We predict the existence of a new class of phases in weakly coupled, three-dimensional stacks of two-dimensional (2D) XY models. These “sliding phases” behave like decoupled, independent 2D XY models with zero free-energy cost for macroscopic relative rotation of spins in different layers and algebraic decay of two-point spin correlation functions 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.
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