Fig. 4

Surface tension of amorphous–amorphous interfaces. a Normalized histogram of height fluctuations for various ϕs. The black lines represent Gaussian fits to the data. b Interface width w versus ϕ for amorphous wall (hollow squares) and for self-induced pins (hollow circles). Error bars represent the standard deviation of w obtained from distinct self-induced pins. c L〈|A(k)|²〉k² versus k for a representative self-induced pin. ϕ = 0.68 (pink circles), ϕ = 0.71 (orange triangles), ϕ = 0.74 (gray diamonds), ϕ = 0.75 (dark yellow stars), ϕ = 0.76 (red inverted triangles), and ϕ = 0.79 (blue squares). d The small hollow circles represent ϒ for distinct self-induced pins and the large circles represent their average for each ϕ. ϒ versus ϕ for amorphous wall (hollow squares). e The background image represents p_c(t = 7t*) for ϕ = 0.79. f Snapshot of liquid configuration corresponding to e. In e and f, the trajectories of the top 1% most-mobile particles are shown by the colored symbols