Nonlinear topological valley Hall edge states arising from type-II Dirac cones
Nonlinear topological valley Hall edge states arising from type-II Dirac cones
Type-II Dirac/Weyl points, although impermissible in particle physics due to Lorentz covariance, were uncovered in condensed matter physics, driven by fundamental interest and intriguing applications of topological materials. Recently, there has been a surge of exploration of such generic points using various engineered platforms including photonic crystals, waveguide arrays, metasurfaces, …