Realizing Rice-Mele model on Floquet lattice

Finding topological properties in time-periodic Hamiltonian has focused physicists more than decades. The celebrated Rice-Mele model is a well-known nontrivial time-periodic Hamiltonian, whose topological invariant represents the amount of charge pump. In our research, we construct a Floquet system with multiple frequencies which has similar analogy with Rice-Mele model. This system changes the role of position and time in Rice-Mele model into frequency and momentum respectively, and can be realized by simply tuning the direction of time-periodic magnetic field on a single-spin system. We also address the physical evidence of the protected topological number obtained by measuring the mean phase velocity of the spin state.