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Lattice polymers with two competing collapse interactions
  • Andrea Bedini,
  • Aleksander Owczarek,
  • Thomas Prellberg
Andrea Bedini
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Aleksander Owczarek
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Thomas Prellberg
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We study a generalised model of self-avoiding trails, containing two different types of interaction (nearest-neighbour contacts and multiply visited sites), using computer simulations. This model contains various previously-studied models as special cases.

We find that the strong collapse transition induced by multiply-visited sites is a singular point in the phase diagram and corresponds to a higher order multi-critical point separating a line of weak second-order transitions from a line of first-order transitions.