Magnetic impurities in topological insulators (TIs) induce backscattering via magnetic torque, unlike pristine TIs where spin-orbit locking promotes dissipationless surface states. Here we reveal that one can suppress that unwanted backscattering and dissipation in magnetic TIs using high-frequency linearly polarized light (LPL). By carefully considering the hexagonal warping of the Fermi surface of the TI, we demonstrate how the coupling between Dirac surface states and LPL can effectively reduce backscattering on magnetic dopants, enhance carrier mobility, and suppress resistance, even entirely. These findings open up avenues for designing ultralow-power sensing and spintronic technology.

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• Dilute magnetic topological insulators
• Light-matter interaction
• Optoelectronics
• Quantum transport
• Floquet systems
• Topological materials
• Bloch-Floquet theorem
• Landauer formula