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Related Experiment Video

Updated: May 31, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Interlayer reconstruction phase transition in van der Waals materials.

Junwei Zhang¹, Laiyuan Wang², Jingtao Lü³

¹School of Materials and Energy, or Electron Microscopy Centre of Lanzhou University, Lanzhou University, Lanzhou, China.

Nature Materials

|January 24, 2025

Summary

This summary is machine-generated.

Researchers visualized rapid phase transitions in indium selenide (In2Se3) using in situ electron microscopy. They discovered a unique unzipping-zipping mechanism driving structural changes, crucial for designing advanced materials.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Van der Waals materials exhibit diverse structural polymorphs with unique physical properties.
Understanding phase-transition dynamics is key to unlocking their technological potential.
Direct visualization of rapid phase transitions is challenging due to imaging limitations.

Purpose of the Study:

To atomistically visualize and understand the dynamics of the 2H-α to 2H-β phase transition in layered In2Se3.
To elucidate the atomic mechanisms and propagation pathways governing this phase transition.
To investigate the influence of current-driven stimuli on phase-transition behavior.

Main Methods:

Utilized in situ scanning transmission electron microscopy (STEM) for atomic-resolution imaging.
Employed a controllable current-driven phase transition in layered In2Se3.
Analyzed dynamic atomic rearrangements during the phase transition process.

Main Results:

Identified a novel intralayer-splitting (unzipping) and interlayer-reconstruction (zipping) pathway.
Revealed an energy-cascading mechanism where interlayer bond formation drives intralayer bond cleavage.
Observed current-direction-dependent asymmetric phase-transition propagation due to Peltier effect-induced temperature gradients.

Conclusions:

The study provides unprecedented atomic-level insights into the dynamics of phase transitions in Van der Waals materials.
The discovered unzipping-zipping mechanism and energy-cascading effect offer a new perspective on phase-transition control.
Findings are crucial for designing and engineering tailored structural phase transitions for advanced technological applications.