The state-of-the-art knowledge of ferroelectric and ferroelastic group-IV monochalcogenide
monolayers is surveyed. These semiconductors feature remarkable structural and …

The family of emerging low‐symmetry and structural in‐plane anisotropic two‐dimensional
(2D) materials has been expanding rapidly in recent years. As an important emerging …

Nonlinear photocurrent in time-reversal invariant noncentrosymmetric systems such as
ferroelectric semimetals sparked tremendous interest of utilizing nonlinear optics to …

The second-order nonlinear optical (NLO) processes, such as photogalvanic effect and
second-order harmonic generation (SHG), play crucial roles in probing and controlling light …

The short timescale spin dynamics in antiferromagnets is an attractive feature from the
standpoint of ultrafast spintronics. Yet generating highly polarized spin current at room …

Group IV monochalcogenides exhibit spontaneous polarization and ferroelectricity, which
are important in photovoltaic materials. Since strain engineering plays an important role in …

A bulk material without inversion symmetry can generate a direct current under illumination.
This interface-free current generation mechanism, referred to as the bulk photovoltaic effect …

Monolayer group-IV monochalcogenides (MX, M ¼ Ge, Sn, Pb; X ¼ S, Se, Te) are a family of
novel two-dimensional (2D) materials that have atomic structures closely related to that of …

Group-IV monochalcogenides, such as germanium selenide (GeSe), are strongly
anisotropic semiconducting van der Waals crystals isoelectronic to black phosphorus, with …

Light–matter interaction is one of the key routes to understanding and manipulating
geometric and electronic behaviors of materials, especially two-dimensional materials which …