Fig. 3: Implementation of unidirectional electrical circuit and observation of STL.
From: Scale-tailored localization and its observation in non-Hermitian electrical circuits
a Experimental design of the unidirectional circuit array. Each unit cell consists of an LC resonator with a capacitor C0 = 10pF and an inductor L = 220 μH, a VF, and a connecting capacitor C1 = 220pF. b VF as the active device with mismatched input and output currents. c The fabricated circuit board with 20 unit cells. The long-range coupling is controlled by electrical switches. d Eigenvalues of the admittance matrix with different (N, l) = (20, 4) (red), (20, 6) (blue), (20, 9) (pink), and (20, 15) (green). (e1–e4) Spatial profiles of all scale-tailored localized eigenstates (corresponding to the eigenvalues distributed on the circle) of the admittance matrix with different (N, l). The experimental results (solid diamonds) align with the theoretical results (hollow circles). e5 Rescaled spatial distributions divided by the coupling range l of the scale-tailored localized eigenstates. Other parameters are: ω = 2π × 100kHz, C2 = 10pF, C3 = 220pF.
