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Disordered solids exhibit unusual properties of their vibrational states andthermal conductivities. Recent progresses have well established the concept of"elastic heterogeneity", i.e., disordered materials show spatiallyinhomogeneous elastic moduli. In this study, by using molecular-dynamicssimulations, we gradually introduce "disorder" into a numerical system tocontrol its modulus heterogeneity. The system starts from a perfect crystallinestate, progressively transforms into an increasingly disordered crystallinestate, and finally undergoes structural amorphisation. We monitor independentlythe elastic heterogeneity, the vibrational states, and the thermal conductivityacross this transition, and show that the heterogeneity in elastic moduli iswell correlated to vibrational and thermal anomalies of the disordered system.

Elastic heterogeneity, vibrational states, and thermal conductivity across an amorphisation transition