title: Griffiths singularities in unbinding of strongly disordered polymers.
abstract: Griffiths singularities occurring in the unbinding of strongly disordered heteropolymers are studied. A model with two randomly distributed binding energies, -1 and -v, is introduced and studied analytically by analyzing the Lee-Yang zeros of the partition sum. It is demonstrated that in the limit v--> infinity the model exhibits a Griffiths type singularity at a temperature T(G)=O(1) corresponding to melting of long homogeneous domains of the low binding energy. For finite v>>1 the model is expected to exhibit an additional, unbinding, transition at a high temperature T(M)=O(v).
authors.affiliation: Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel 76100.
authors.forename: Y
authors.initials: Y
authors.lastname: Kafri
authors.forename: D
authors.initials: D
authors.lastname: Mukamel