Probing Topological Phase Transitions in Monolayer Jacutingaite through Magneto-Optics

We present a theoretical framework to investigate quantum magnetotransport in monolayer jacutingaite,

focusing on its response to external electric fields and off-resonant circularly polarized laser irradiation. Our

analysis reveals a sequence of topological phase transitions triggered by tuning these external parameters.

Applying a perpendicular magnetic field, we study Landau level (LL) formation, spin- and valley-polarized

splitting, and magneto-optical response in distinct topological phases. We find that the zeroth LL exhibits

spin- and valley-polarized splitting, leading to four distinct peaks in the DOSs for the K and K valleys. We

demonstrate that reversing the electric field or flipping the light helicity changes the Dirac mass sign in specific

spin-valley sectors, which in turn reverses both the Berry curvature and the magnetic moment. Our results reveal

that external electric, magnetic, and off-resonant optical fields can control these conductivities. These findings

highlight monolayer jacutingaite as a highly tunable platform with strong potential for future applications in

photonics, optoelectronics, and topological quantum devices.