# Observing zero-field spin dynamics with spin noise in a pi-pulse modulated field

## TL;DR

This paper demonstrates a method to observe zero-field spin dynamics using spin noise spectroscopy with pi-pulse modulation, effectively eliminating low-frequency noise interference.

## Contribution

It introduces a novel pi-pulse modulation technique that enables clear observation of zero-field spin dynamics free from 1/f noise.

## Key findings

- Spin noise spectrum centered at half the modulation frequency reveals zero-field spin dynamics.
- Pi-pulse modulation suppresses low-frequency 1/f noise in spin noise spectroscopy.
- Method provides a clearer understanding of spin behavior in zero magnetic fields.

## Abstract

Spin noise spectroscopic study of spin dynamics in a zero magnetic field is commonly frustrated by the dominating 1/f noise. We show that in a pi-pulse modulated magnetic field, spin noise spectrum centered one-half of the field modulation frequency reveals spin dynamics in zero-fields, free of any low-frequency noises.