Quantum Electronic Transport through a Precessing Spin

TL;DR

This paper investigates how a precessing nuclear spin influences electronic conductance, revealing oscillations at the Larmor frequency and its harmonic, tunable by chemical potential and spin coupling.

Contribution

It introduces a detailed analysis of conductance oscillations caused by a precessing spin using the equations-of-motion approach, highlighting the role of spin flip coupling.

Findings

Conductance oscillates with the Larmor frequency and its harmonic.

Oscillation amplitudes are tunable via chemical potential and spin flip coupling.

Precessing spin significantly affects electronic transport properties.

Abstract

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 ($\omega_{L}$), the conductance develops the oscillation with the frequency of both $\omega_{L}$ and 2$\omega_{L}$ components, the relative spectrum weight of which can be tuned by the chemical potential and the spin flip coupling.