Krypton on graphite and the striped helical Potts model

A generalization of the helical Potts model, with two species of domain wall due to explicit triaxial helical symmetry breaking, is studied via position-space renormalization-group methods and is discovered to exhibit striped, as well as hexagonal, phases. The disordering transition of the commensurate ferromagnetic phase belongs to the symmetric Potts universality class. No evidence is found for a chiral melting transition. Commensurate-incommensurate phase diagrams for oversaturated krypton on graphite are constructed.