Terahertz optics-driven phase transition in two-dimensional multiferroics

Displacive martensitic phase transition is potentially promising in semiconductor based data storage applications with fast switching speed. In addition to traditional materials, the recently discovered two-dimensional ferroic materials are receiving lots of attention owing their dynamics, which could tremendously boost density and enhance read/write this study, we propose that a terahertz laser an intermediate intensity selected frequency can trigger order multiferroics, damage-free noncontacting approach. Through first-principles calculations, theoretically computationally investigate optically induced electronic, phononic, mechanical responses two experimentally fabricated multiferroic (with both ferroelastic ferroelectric) \b{eta}-GeSe {\alpha}-SnTe monolayer. We show relative stability different orientation variants be effectively manipulated via polarization direction laser, selectively strongly coupled transverse optical phonon modes. The from one variant another barrierless, indicating ultrafast kinetics conventional nucleation-growth process avoidable.