Fig. 1: Single atom nuclear polarization.
From: Coherent spin dynamics between electron and nucleus within a single atom
a STM topography of the single 47Ti studied in this work. A schematic drawing shows the magnetic STM tip above the electron spin (blue) and nuclear spin (red) of the single atom. b Energy diagram of the spin states of a single 47Ti. In the low field regime, avoided crossings appear between the different eigenstates. In the high field regime, the eigenstates resemble Zeeman product states. ESR transitions (purple arrows) can be driven between states with equal nuclear spin. c ESR-STM measurements at different applied DC bias (T = 1.5 K, Bext = 1.5 T, VRF = 25 mV, Iset = 2.5 pA, f0 = 11.5–12.56 GHz). The observed variation in resonance frequency f0 likely results from a combination of the tip field changing with tip height and a voltage dependence of the resonance28. Line traces at 35 mV, 80 mV, and 120 mV are shown with fits using six Fano lineshapes scaled by the Boltzmann factor in order to extract an effective temperature.
