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The valley-polarized quantum anomalous Hall (VQAH) state, which forwards astrategy for combining valleytronics and spintronics with nontrivial topology,attracts intensive interest in condensed-matter physics. So far, the exploredVQAH states have still been limited to magnetic systems. Here, using thelow-energy effective model and Floquet theorem, we propose a differentmechanism to realize the Floquet VQAH state in nonmagnetic heterobilayers underlight irradiation. We then realize this proposal via first-principlescalculations in transition metal dichalcogenide heterobilayers, which initiallypossess the time-reversal invariant valley quantum spin Hall (VQSH) state. Byirradiating circularly polarized light, the time-reversal invariant VQSH statecan evolve into the VQAH state, behaving as an optically switchable topologicalspin-valley filter. These findings not only offer a rational scheme to realizethe VQAH state without magnetic orders, but also pave a fascinating path fordesigning topological spintronic and valleytronic devices.

Floquet Valley-Polarized Quantum Anomalous Hall State in Nonmagnetic Heterobilayers