Jones, HFHFJonesChristodoulides, DemetriosYang, Jianke2019-10-092020-11-282019Parity-time Symmetry and its Applications, 2019, pp.185-2149789811312465http://hdl.handle.net/10044/1/73837We present exact analytical results for the sinusoidal optical potentials υ(x) ∝ cosKx + iλ sinKx, particularly for the special case λ = 1. This is at the borderline between broken and unbroken PT symmetry, and propagation through such an optical lattice exhibits many remarkable properties.© Springer Nature Singapore Pte Ltd. 2018.ScienceChapterhttps://www.dx.doi.org/10.1007/978-981-13-1247-2https://link.springer.com/chapter/10.1007%2F978-981-13-1247-2_7