Photogalvanic effect in multiferroic breathing Kagome lattice

Photogalvanic effect, as a second-order nonlinear optical response, can generate an electric current in non-centrosymmetric materials when exposed to light irradiation. In this talk, we investigate monolayer Nb3I8, a recently fabricated two-dimensional multiferroic breathing Kagome material. Our first-principles calculations reveal a remarkable sensitivity of nonlinear photocurrent to variations in the magnetic order in monolayer Nb3I8. Furthermore, nonlinear photocurrent can also be manipulated by switching the electric polarization. In contrast, the linear optical response almost remains unaffected by changes in the magnetic and ferroelectric orders. Our findings offer several avenues to control second-order photocurrent and the potential to utilize multiferroic breathing Kagome materials for magnetic-field sensors.