2013/12/12 by K. Li, P. G. Kevrekidis, Li, K. +3
Physics and Astronomy · #FOS: Physical sciences #Optics (physics.optics) #Pattern Formation and Solitons (nlin.PS) #nlin.PS #physics.optics
paper · pdf · doi:10.48550/arxiv.1312.3376
Studies in Applied Mathematics, in press (special issue "Nonlinear Wave Phenomena in PT-Symmetric Systems")
arxiv created 2013/12/12 · arxiv updated 2013/12/13
The subject of the work are pairs of linearly coupled PT-symmetric dimers. Two different settings are introduced, namely, straight-coupled dimers, where each gain site is linearly coupled to one gain and one loss site, and cross-coupled dimers, with each gain site coupled to two lossy ones. The latter pair with equal coupling coefficients represents a "PT-hypersymmetric" quadrimer. We find symmetric and antisymmetric solutions in these systems, chiefly in an analytical form, and explore the existence, stability and dynamical behavior of such solutions by means of numerical methods. We thus identify bifurcations occurring in the systems, including spontaneous symmetry breaking and saddle-center bifurcations. Simulations demonstrate that evolution of unstable branches typically leads to blowup. However, in some cases unstable modes rearrange into stable ones.