Large-scale exponential correlations of non-affine elastic response of strongly disordered materials (2505.04554v1)

Abstract: The correlation properties of non-affine elastic response in strongly disordered materials are investigated using the theory of correlated random matrices and molecular dynamics simulations. The random matrix theory shows that the divergence of the non-affine displacement field has large-scale exponentially decaying correlations. The corresponding length scale $\xi$ is determined by the strength of the disorder and can be indefinitely large, significantly exceeding the correlation length of the disorder. The rotor of the non-affine displacement field has the same length scale $\xi$ except the case of the volumetric deformation. The main theoretical dependencies are confirmed by molecular dynamics simulation of a model polystyrene in the amorphous state.