First generations of a branch of a square Husimi tree: 0 denotes the root site, while (0,1,2,3) is the first building block.
Finite-length closed-loop configuration of the polymer chain to be assigned a zero statistical weight.
Grand canonical ( vs ) phase diagrams for zero (a) and nonzero (b) stacking energies. Solid and dotted lines denote first and second order transitions, respectively. The inset displays the critical end-point region.
Critical end-point temperature and point temperature as a function of the stacking parameter .
Fraction of paired segments as a function of temperature ( vs ) in the isolated-molecule limit, for the zero-stacking case . A dotted line denotes the discontinuity occurring at the critical end point.
Entropy per segment as a function of temperature ( vs ) in the isolated-molecule limit, for different values of the stacking energy. Dotted lines denote the discontinuities.
Plaquette configurations denoted in the text as two-bulge , three-bulge , and four-bulge .
Conditional bulge probabilities , , and (see the text).
Local (site) polymer configurations, labels , mapping function , and bond occupation numbers , , as defined in the text.
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