The discovery of ferroelectricity in two-dimensional (2D) van der Waals (vdW) materials has
brought important functionalities to the 2D materials family, and may trigger a revolution in …

Copper indium thiophosphate, CuInP 2 S 6, has attracted much attention in recent years due
to its van der Waals layered structure and robust ferroelectricity at room temperature. In this …

The formation of topological defects after a symmetry-breaking phase transition is an
overarching phenomenon that encodes the underlying dynamics. The Kibble–Zurek …

In this study, we investigate the underlying mechanisms of the universal negative
piezoelectricity in low-dimensional layered materials by carrying out first-principles …

Piezoelectrics are a class of functional materials that have been extensively used for
application in modern electro-mechanical and mechatronics technologies. The sign of …

Materials with negative longitudinal piezoelectric response have been a focus of recent
research. So far, reported examples are mostly three-dimensional bulk materials, either …

Auxetic materials are characterized by a negative Poisson's ratio that they expand laterally
in the directions perpendicular to the applied stretching stress and vice versa. Piezoelectrics …

Bismuth telluride halides (BiTeX) are Rashba-type crystals with several potential
applications ranging from spintronics and nonlinear optics to energy. Their layered …

The negative piezoelectric coefficient in ferroelectric polymers has been widely studied.
However, the same in the two-dimensional (2D) materials is scarcely reported, which …

Bismuth-based binary compounds, including Bi 2 Se 3 and Bi 2 Te 3, have attracted
increasing attention as well-known topological insulators. On the other hand, bismuth-based …