A Van der Waals Material Exhibiting Room Temperature Broken Inversion Symmetry with Ferroelectricity.

ABSTRACT: Since the initial synthesis of van der Waals 2D indium selenide is first documented in 1957, five distinct polymorphs and their corresponding polytypes are identified. In this study, a unique phase of indium selenide is reported via Scanning Transmission Electron Microscopy (STEM) analysis in the synthesized large-area films - which is named the βp$\ubeta^{\text{p}}$ phase. The quintuple layers of the βp$\ubeta^{\text{p}}$ phase, characterized by a unique zigzag atomic configuration with unequal indium-selenium bond lengths from the middle selenium atom, are distinct from any other previously reported phase of indium selenide. Cross-sectional STEM analysis has revealed that the βp$\ubeta^{\text{p}}$ layers exhibit intralayer shifting. It is found that indium selenide films with βp$\ubeta^{

SUBMITTER: Athena FF 

PROVIDER: S-EPMC12904008 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature