On May 13, 2026, a research team led by Professor Song Zhitang from the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, made headlines by publishing a groundbreaking research paper titled "Non-Arrhenius threshold switching by field-driven dipolar ordering" in the prestigious international journal Nature Communications. This study tackled a long-standing issue: the structural disorder inherent in chalcogenide amorphous materials, which has long impeded a comprehensive understanding of threshold switching mechanisms. To overcome this, the team employed a cutting-edge approach, integrating atomic-resolution Ångström-beam electron diffraction with electric field-coupled ab initio molecular dynamics simulations.

For the first time, the researchers successfully captured the dynamic process of electric field-induced reverse displacement of Ge and Se atoms. This process led to the formation of one-dimensional dipole-ordered chains within amorphous GeSe on a picosecond timescale. This pivotal discovery sheds light on a novel mechanism of dipole ordering that directs the growth of conductive channels. Remarkably, this mechanism transcends the speed limitations set by traditional thermal activation theory, thereby providing a solid theoretical underpinning for the utilization of amorphous chalcogenide materials in innovative memory and neuromorphic computing applications.