Illustration of the essential parameters for calculating the H function between two parallel cylinders using Eq. (8). y0,1 and y0,2 are the positions of the nanowire bases in our chosen coordinate system (cf., Figure 4B), R1 and R2 are the radii, L1 and L2 are the lengths of nanowire 1 and nanowire 2, respectively, and R0 is the distance between the two centers.