Resonant and Time-Resolved Spin Noise Spectroscopy

TL;DR

This paper introduces a novel resonant and time-resolved spin noise spectroscopy method that extends pulsed laser measurements to longer spin lifetimes using an analog detection scheme and advanced modeling.

Contribution

It presents a new approach combining resonant and time-resolved techniques with a model to accurately measure spin properties over extended timescales.

Findings

Extended measurement range for long spin lifetimes.

Accurate extraction of g-factor, cross-section, and spin lifetime.

Effective modeling of finite detector response.

Abstract

We demonstrate a method to extend the range of pulsed laser spin noise measurements to long spin lifetimes. We use an analog time-domain detection scheme with a bandwidth limited only by laser pulse duration. Our model uses statistics and Bloch-Torrey equations to extract the Lande g-factor, Faraday cross-section $\sigma_F$, and spin lifetime $\tau_S$, while accounting for finite detector response. Varying the magnetic field with a fixed probe-probe delay yields $\tau_S$ when it is longer than the laser repetition period. Varying the probe-probe delay with a fixed field produces a time-domain measurement of the correlation function.