Abstract
We study periodically driven closed quantum systems where two parameters of the system Hamiltonian are varied periodically in time with frequencies and . We show that such drives may be used to tune towards dynamics-induced freezing where the wave function of the state of the system after a drive cycle at time has almost perfect overlap with the initial state. We locate regions in the plane where the freezing is near exact for a class of integrable models and a specific nonintegrable model. The integrable models that we study encompass Ising and models in , Kitaev model in , and Dirac fermions in graphene and atop a topological insulator surface, whereas the nonintegrable model studied involves the experimentally realized one-dimensional tilted Bose-Hubbard model in an optical lattice. In addition, we compute the relevant correlation functions of such driven systems and describe their characteristics in the region of the plane where the freezing is near exact. We supplement our numerical analysis with semianalytic results for integrable driven systems within adiabatic-impulse approximation and discuss experiments which may test our theory.
2 More- Received 14 May 2016
DOI:https://doi.org/10.1103/PhysRevB.94.075130
©2016 American Physical Society