Topological phases in adiabatic and nonadiabatic driven systems

In this work we study the geometrical and topological properties of nonequilibrium quantum systems driven by ac fields. We consider two tunnel-coupled spin qubits driven by either spatially homogeneous or inhomogeneous ac fields. Our analysis is an extension of the classical model introduced by Berry with the addition of the spatial degree of freedom. We calculate the Berry and Aharonov-Anandan geometric phases, and demonstrate the influence of the different field parameters in the geometric properties. We also discuss the topological properties associated with the different driving regimes, and show that by tuning the different parameters one can induce topological phase transitions, even in the nonadiabatic regime.