Low-frequency noise in tunneling through a single spin

TL;DR

This paper proposes using low-frequency noise measurements in tunneling currents through a single spin molecule to identify spin-dependent tunneling mechanisms, predicting a distinctive zero-frequency noise feature near the Larmor frequency.

Contribution

It introduces a novel experimental approach and theoretical prediction for detecting spin-dependent tunneling via low-frequency noise spectrum analysis.

Findings

Predicted a zero-frequency noise tail near the Larmor frequency

Amplitude and width of the noise feature are comparable to the Larmor peak

The ratio of noise amplitudes at zero and Larmor frequencies aids in testing theories

Abstract

We propose measurements of low-frequency noise in the tunneling current through a single molecule with a spin as an experimental probe for identifying a mechanism of the spin-dependent tunneling. A specific tail near the zero frequency in the noise spectrum is predicted; the amplitude and the width of being of the same order of magnitude as the recently reported peak in the noise spectrum at the spin Larmor frequency. The ratio of the spectrum amplitudes at zero- and Larmor frequencies is shown to be a convenient tool for testing theoretical predictions.