Quantum Electronic Transport through a Precessing Spin

The conductance through a local nuclear spin precessing in a magnetic field is studied by using the equations-of-motion approach. The characteristics of the conductance is determined by the tunneling matrix and the position of equilibrium chemical potential. We find that the spin-flip coupling between the electrons on the spin site and the leads produces the conductance oscillation. When the spin is precessing in the magnetic field at Larmor frequency ([Formula presented]), the conductance develops the oscillation with the frequency of both [Formula presented] and [Formula presented] components, the relative spectrum weight of which can be tuned by the chemical potential and the spin-flip coupling.