Fingerprints of single nuclear spin energy levels using STM - ENDOR

(a) Shows the STM power spectra at magnetic field of 210G above a SiC surface. The red arrow at 590 MHz corresponds to an electronic transition that includes hyperfine coupling. (b) Shows the ENDOR spectrum, i.e. the intensity of the 590 MHz peak as function of an irradiation frequency. The splitting of 350 KHz corresponds to the nuclear Zeeman frequency.64