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Photostriction is predicted for group-IV monochalcogenide monolayers, two-dimensional ferroelectrics with rectangular unit cells (the lattice vector a₁ is larger than a₂) and an intrinsic dipole moment parallel to a₁. Photostriction is found to be related to the structural change induced by a screened electric polarization (i. e. , a converse piezoelectric effect) in photoexcited electronic states with either pₗ or pₘ (in-plane) orbital symmetry that leads to a compression of a₁ and a comparatively smaller increase of a₂ for a reduced unit cell area. The structural change documented here is 10 times larger than that observed in BiFeO₃, making monochalcogenide monolayers an ultimate platform for this effect. This structural modification should be observable under experimentally feasible densities of photexcited carriers on samples that have been grown already, having a potential usefulness for light-induced, remote mechano-optoelectronic applications.
Haleoot et al. (Tue,) studied this question.