8 papers
On phase separation and crystallization of Ge-rich GeSbTe alloys from atomistic simulations with a machine learning interatomic potential
Omar Abou El Kheir, Dario Baratella, Marco Bernasconi
We developed a machine learning interatomic potential (MLIP) for Ge-rich GeSbTe alloys of interest for applications in phase change memories embedded in microcontrollers. The MLIP…
On the origin of in-gap states in amorphous GeSbTe
Omar Abou El Kheir, Marco Bernasconi
The localized states in the band gap of amorphous phase change alloys like GeSbTe control the electrical conduction via the Poole-Frenkel mechanism. Understanding the o…
Liquid anomalies and Fragility of Supercooled Antimony
Flavio Giuliani, Francesco Guidarelli Mattioli, Yuhan Chen +5
Phase-change materials (PCMs) based on group IV, V, and VI elements, such as Ge, Sb, and Te, exhibit distinctive liquid-state features, including thermodynamic anomalies and unusua…
Viscosity, breakdown of Stokes-Einstein relation and dynamical heterogeneity in supercooled liquid GeSbTe from simulations with a neural network potential
Simone Marcorini, Rocco Pomodoro, Omar Abou El Kheir +1
Phase change materials are exploited in non-volatile electronic memories and photonic devices that rely on a fast and reversible transformation between the amorphous and crystallin…
Microscopic model of the operation of the Single-chalcogenide X-point Memory
P. Fantini, A. Ghetti, E. Varesi +8
Ovonic threshold switching is the key process for several applications of chalcogenide alloys including phase change memories and selector elements in cross-points arrays. Very rec…
From Continuous to First-Order-Like: Amorphous-to-Amorphous Transition in Phase-Change Materials
Tomoki Fujita, Yoshio Kono, Yuhan Chen +13
Polymorphism is ubiquitous in crystalline solids. Amorphous solids, such as glassy water and silicon, may undergo amorphous-to-amorphous transitions (AATs). The nature of AATs rema…