Electrically detected magnetic resonance of $^{75}$As magnetic clock transitions in silicon

TL;DR

This study demonstrates the detection of magnetic clock transitions in near-surface $^{75}$As spins in silicon using low-field EDMR, highlighting its potential for quantum device applications.

Contribution

First observation of magnetic clock transitions in near-surface $^{75}$As spins in silicon via low-field EDMR, providing a new sensitive probe for quantum systems.

Findings

Pronounced linewidth broadening near CTs observed.

Low-field EDMR effectively detects CTs in donor spins.

Results support EDMR as a tool for quantum device research.

Abstract

Magnetic clock transitions (CTs), defined by vanishing first-order sensitivity of the transition frequency to magnetic field fluctuations, provide a powerful route to suppress decoherence in donor spin systems. Here, we present the observation of magnetic field CTs from an ensemble of near-surface $^{75}$As ($I = 3/2$) spins in silicon using low-field ($< 10$~mT) continuous-wave electrically detected magnetic resonance (EDMR). As the CT condition is approached, pronounced linewidth broadening is observed, consistent with a donor Hamiltonian informed linewidth model. These results establish low-field EDMR as a sensitive probe of CTs in near-surface donor systems relevant to silicon-based quantum devices.