Off-campus UMass Amherst users: To download dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password.

Non-UMass Amherst users, please click the view more button below to purchase a copy of this dissertation from Proquest.

(Some titles may also be available free of charge in our Open Access Dissertation Collection, so please check there first.)

Discrete parity-time symmetric nonlinear Schrodinger lattices

Kai Li, University of Massachusetts Amherst


In this thesis we summarize the classical cases of one-dimensional oligomers and two-dimensional plaquettes, respecting the parity-time ( PT ) symmetry. We examine different types of solutions of such configurations with linear and nonlinear gain or loss profiles. For each configuration, we develop a dynamical model and examine its PT symmetry. The corresponding nonlinear modes are analyzed starting from the Hamiltonian limit, with zero value of the gain-loss coefficient. Once the relevant waveforms have been identified (analytically or numerically), their stability as well as those of the ghost states in certain regimes is examined by means of linearization in the vicinity of stationary points. This reveals diverse and, occasionally, fairly complex bifurcations. The evolution of unstable modes is explored by means of direct simulations.^

Subject Area

Applied mathematics

Recommended Citation

Li, Kai, "Discrete parity-time symmetric nonlinear Schrodinger lattices" (2014). Doctoral Dissertations Available from Proquest. AAI3615429.