We study the structural correlations and the nonlinear response to a driving force of a two-dimensional phase-field-crystal model with random pinning. The model provides an effective continuous description of lattice systems in the presence of disordered external pinning centers, allowing for both elastic and plastic deformations. We find that the phase-field crystal with disorder assumes an amorphous glassy ground state, with only short-ranged positional and orientational correlations, even in the limit of weak disorder. Under increasing driving force, the pinned amorphous-glass phase evolves into a moving plastic-flow phase and then, finally, a moving smectic phase. The transverse response of the moving smectic phase shows a vanishing transverse critical force for increasing system sizes.
- disordered system
- multiscale modeling
- Phase-field crystal
- two-dimensional glass
Granato, E., Ramos, J. A. P., Achim, C. V., Lehikoinen, J., Ying, S. C., Ala-Nissila, T., & Elder, K. (2011). Glassy phases and driven response of the phase-field-crystal model with random pinning. Physical Review E, 84(3), 1-8. . https://doi.org/10.1103/PhysRevE.84.031102