Nuclear Spin Noise and STM Noise Spectroscopy

TL;DR

This paper explores how noise spectroscopy via STM can detect nuclear spin dynamics through hyperfine interactions, revealing nuclear behavior indirectly by analyzing electronic spin fluctuations and their spectral satellites.

Contribution

It introduces a method to observe nuclear spin dynamics using STM noise spectroscopy, highlighting the role of hyperfine coupling and RF fields in detecting nuclear spins indirectly.

Findings

Detection of satellites at Larmor frequency and zero frequency due to hyperfine coupling.

RF field near nuclear resonance enhances nuclear spin detection.

STM noise spectroscopy can reveal nuclear spin dynamics indirectly.

Abstract

We consider fluctuations of the electronic spin due to coupling to nuclear spin. Noise spectroscopy of an electronic spin can be revealed in the Scanning Tunnelling Microscope (STM). We argue that the noise spectroscopy of electronic spin can reveal the nuclear spin dynamics due to hyperfine coupling. Tunnelling current develops satellites of the main lines at Larmor frequency and at zero frequency due to hyperfine coupling. We also address the role of the rf field that is at or near the resonance with the nuclear hyperfine field. This approach is similar to Electron Nuclear Double Resonance (ENDOR), in that is allows one to detect nuclear spin dynamics indirectly through its effect on electronic spin.