From Crosslinks to Collapse to Freezing: New Multicritical Point in Heteropolymers
نویسنده
چکیده
We consider a two-letter self-avoiding lattice heteropolymer model of NH (out of N) attracting sites. At zero temperature, chain size scales as N1/dF (ρH = NH/N) with novel universal exponents describing asymptopia (d is space dimension). The phase diagram includes a new multicritical point at ρH < 1 where a line of collapse critical points ends at a freezing transition, with entropy approaching zero as (ρH − ρH) 0.5 (d = 2). The related problem of random crosslinks in polymers is analyzed. Theoretical arguments predict different universality classes and scaling relations. The implications to the vulcanization transition, NMR structure determination and protein folding are discussed. PACS numbers: 05.70.Fh, 82.35.+t, 61.41.+e, 87.15.By Typeset using REVTEX
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تاریخ انتشار 1996