Universality classes for depinning transitions of two heteropolymers

TL;DR

This paper investigates the depinning transitions of two directed heteropolymers with long-range interactions, revealing new universality classes and disorder-induced changes in phase transition behavior.

Contribution

It introduces a model for heteropolymer depinning with long-range interactions and identifies new universality classes distinct from homopolymer cases.

Findings

New universality classes for heteropolymer depinning transitions.

Disorder can change the order of the phase transition.

Predicted sign change in the specific heat exponent due to disorder.

Abstract

We study a solid-on-solid model for depinning transitions of two directed heteropolymers with an effective long range interaction decaying as the inverse square of their distance. Exact calculations of the localization length and specific heat non-universal critical exponents indicate that new universality classes govern the depinning transitions, different from those found for interacting homopolymers. Disorder driven change in the order of the phase transition and in the sign of the specific heat exponent are predicted.