Fig. 1: Two-dimensional model of Wilson fermions.
From: Realization of Wilson fermions in topolectrical circuits
a Illustration of a 2D spinful square lattice. b The circuit realization of the hopping terms by A+B parts. Part A consists of two kinds of capacitors ± C1 and the negative impedance converters with current inversion (INICs). Part B is composed of two types of capacitors ± C2. The red rectangle indicates the correspondence between spin and circuit nodes. c Details of the INIC. The INIC is composed of an operational amplifier (OP) and three resistors R, acting as a positive (negative) resistor from right to left (left to right). d The realization of the staggered on-site potentials.
