Real Time Electrical Detection of Coherent Spin Oscillations

TL;DR

This paper introduces a high-bandwidth radio frequency-reflectometry method for pulsed electrically detected magnetic resonance, enabling real-time observation of coherent spin oscillations and advancing the study of fast spin-dependent processes.

Contribution

The work demonstrates a novel detection scheme that significantly increases bandwidth, allowing real-time measurement of spin dynamics electrically, which was previously limited.

Findings

Bandwidth increased to at least 80 MHz

Real-time measurement of coherent spin oscillations

Quantitative agreement with rate equation simulations

Abstract

We demonstrate that the bandwidth of pulsed electrically detected magnetic resonance can be increased to at least 80 MHz using a radio frequency-reflectometry detection scheme. Using this technique, we measure coherent spin oscillations in real time during a resonant microwave pulse. We find that the observed signal is in quantitative agreement with simulations based on rate equations modeling the recombination dynamics of the spin system under study. The increased bandwidth opens the way to electrically study faster spin-dependent recombination processes, e.g., in direct semiconductors which so far have almost exclusively been studied by optically detected magnetic resonance.