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We theoretically predict the emergence of 120-degree spin order as anonequilibrium steady state in the photodriven Kondo-lattice model on atriangular lattice. In the system away from the half filling with ferromagneticground state, the photoexcitation of conduction electrons and the photoinducedrenormalization of bandwidth cause reconstruction of band structure andsubsequent redistribution of the electrons through relaxations, which result inan electronic structure similar to that in the half-filled system atequilibrium, where the 120-degree spin order is stabilized. In thisphotoinduced 120-degree spin ordered phase, domains of different spin-orderedplanes are formed, and vortices of spin chirality vectors called $Z_2$ vorticesappear at points where multiple domains meet. We also discuss favorableconditions and experimental feasibility to observe the predicted photoinducedmagnetic phase transition by investigating dependencies on the light parameters(amplitude, frequency, and polarization), the electron filling, the strength ofKondo coupling, and the effects of antiferromagnetic coupling among thelocalized spins. Photoinduced magnetic structures proposed so far have beenlimited to simple collinear (anti)ferromagnetic orders or local magneticdefects in magnets. The present work paves a way to optical creation of complexnoncollinear magnetisms as global nonequilibrium steady phase in photodrivensystems.

Photoinduced 120-degree spin order in the Kondo-lattice model on a triangular lattice