Fig. 4: Topological valley kink states with valley-dependent imaginary eigenfrequencies.
From: Non-Hermitian Dirac cones with valley-dependent lifetimes
a Calculated dispersion of a heterostructure with a zigzag interface constructed by a lattice with Ca = 200 nF and Cb = 100 nF at the upper domain and a lattice with Ca = 100 nF and Cb = 200 nF at the lower domain. Other parameters are C = 100 nF, C1 = C2 = 10 nF, L = 1.043 μH and Rs = 30 Ω. The colors denote the imaginary part of eigenfrequencies. b Measured voltage field distributions at 215 kHz with excitations at the left (upper panel) and right (lower panel) sides. The black star denotes the source and the dashed lines mark the location of the zigzag interface. c, d Experimentally measured edge dispersion from Fourier transform of the fields at the interface with excitations at the left (c) and right (d) sides, respectively. The colors represent the normalized Fourier intensity and the dashed lines represent the theoretical results.
