Structure and Dynamics of Supercooled Liquid Ge2Sb2Te5 from Machine- Learning-Driven Simulations

YX Zhou and HY Zhang and VL Deringer and W Zhang, PHYSICA STATUS SOLIDI- RAPID RESEARCH LETTERS, 15, 2000403 (2021).

DOI: 10.1002/pssr.202000403

Studies of supercooled liquid phase-change materials are important for the development of phase-change memory and neuromorphic computing devices. Herein, a machine-learning (ML)-based interatomic potential for Ge2Sb2Te5 (GST) to conduct large-scale molecular dynamics simulations of liquid and supercooled liquid GST is used. A pronounced effect of the thermostat parameters on the simulation results is demonstrated, and it is shown how using a Langevin thermostat with optimized damping values can lead to excellent agreement with reference ab initio molecular dynamics (AIMD) simulations. Structural and dynamical analyses are presented, including the studies of radial and angular distributions, homopolar bonds, and the temperature-dependent diffusivity. Herein, the usefulness of ML-driven molecular dynamics for further studies of supercooled liquid GST, with length and timescales far exceeding those that are accessible to AIMD is demonstrated.

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