| 研究実績の概要 |
Non-Hermitian Hamiltonians which possess PT symmetry can be shown to admit an entirely real eigenspectrum within a certain range of their parameters. It has been shown that certain PT-symmetric lattices can admit topologically non-trivial phases; however, this phase only coincides with the PT-symmetry broken phase, and the topological edge states correspond to imaginary eigenvalues. We examine Floquet driving of this system which, for high enough driving frequencies, has been shown to stabilize the edge states. By using a simple two-step, pulsed time dependence, we explore the entire range of driving frequencies to highlight new regions of stability, including those which are explicitly below the high-frequency regime.
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