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A van der Waals material exhibiting room temperature broken inversion symmetry with ferroelectricity
Fabia F. Athena, Cooper A. Voigt, Mengkun Tian, Anjan Goswami, Emily Toph, Moses Nnaji, Fanuel Mammo, Brent K. Wagner, Sungho Jeon, Wenshan Cai, Eric M. Vogel
https://arxiv.org/abs/2510.03977

A van der Waals material exhibiting room temperature broken inversion symmetry with ferroelectricity
Since the initial synthesis of van der Waals two-dimensional indium selenide was first documented in 1957, five distinct polymorphs and their corresponding polytypes have been identified. In this study, we report a unique phase of indium selenide via Scanning Transmission Electron Microscopy (STEM) analysis in the synthesized large-area films -- which we have named the $β^\text{p}$ phase. The quintuple layers of the $β^\text{p}$ phase, characterized by a unique zigzag atomic configuration wit…