Fig. 2.

Ground states of Co atoms. High-resolution image of Co in a J_T (V_s = −400 mV, I_t = 200 pA, scale bar = 1 nm), b J_H,low (V_s = −60 mV, I_t = 200 pA, scale bar = 1 nm), and c J_H,high (V_s = −60 mV, I_t = 200 pA, scale bar = 1 nm) configurations with same color scale as Fig. 1. DFT calculations of charge density distributions, including magnetic moment (m), n_d, and n_s, for d Co on a top site, e Co in a hollow site, and f Co in a hollow site with U = 4 eV. g–i Schematics of relaxed atomic adsorption geometries with out-of-plane distance (d) noted. j–l dI/dV spectra taken on each atom