Competing phases in spin ladders with ring exchange and frustration

  title={Competing phases in spin ladders with ring exchange and frustration},
  author={Alexandros Metavitsiadis and Sebastian Eggert},
  journal={Physical Review B},
The ground state properties of spin-1/2 ladders are studied, emphasizing the role of frustration and ring exchange coupling. We present a unified field theory for ladders with general coupling constants and geometry. Rich phase diagrams can be deduced by using a renormalization group calculation for ladders with in--chain next nearest neighbor interactions and plaquette ring exchange coupling. In addition to established phases such as Haldane, rung singlet, and dimerized phases, we also observe… 

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