Collapsed and adsorbed states of a directed polymer chain in two-dimensions

Details Collapsed and adsorbed states of a directed polymer chain in two-dimensions Collapsed and adsorbed states of a directed polymer chain in two-dimensions

2000-09-22

arxiv.org/abs/cond-mat/0009345v1

Phase Transitions: vol. 75 (4-5), 2002 pp. 353 - 361

Physics

Condensed Matter

Statistical Mechanics

13 pages including 5 figures; ReVTeX

Scientific paper

A phase diagram for a surface interacting long flexible partially directed polymer chain in a two-dimensional poor solvent where the possibility of collapse in the bulk exists is determined using exact enumeration method. We used a model of self attracting self-avoiding walk and evaluated 30 steps in series. An intermediate phase in between the desorbed collapsed and adsorbed expanded phases having the conformation of a surface attached globule is found. The four phases, viz. (i) desorbed expanded, (ii) desorbed collapsed, (iii) adsorbed expanded, (iv) surface attached globule are found to meet at a multicritical point. These features are in agreement with those of an isotropic (or non directed) polymer chain.

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