Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A and C) 2D zigzag effective site deformation energy E(Δl) as a function of site extension Δl from equilibrium. Convex hull of E(Δl) (red line in A) represents two-phase stretching energy per one site, 
. (B and D) Dependence of the tension force on mean site extension ΔL. Angle deformation stiffness ɛϕ (Fig. 2) is varied. (Left) ɛϕ = 0. (Right) ɛϕ = 0.02.
