Discrete Breathers in a Honeycomb Lattice Near a Semi‐Dirac Point

ABSTRACT

We study the dynamics of discrete breathers—spatially localized and time‐periodic solutions—inside the bandgap of a nonlinear honeycomb lattice where the dispersion landscape approaches a so‐called semi‐Dirac point in which the bands cross linearly in one direction and quadratically in the orthogonal direction. By studying breather dynamics in two opposing asymptotic regimes, near the continuum and anti‐continuum limits, we capture the spatial profiles of hybrid coherent structures having central cores supported on a finite number of lattice sites and infinite decaying tails that are well approximated by exact separable solutions to an effective long‐wave PDE theory at spatial infinity. We find that these breathers are dynamically stable over a wide range of parameters and find an instability transition. Finally, we analyze the Floquet stability of spatially extended nonlinear plane waves bifurcating from the zero solution at the edges of the gap and how they shape breather profiles inside the gap.