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

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.

Main manuscript (7 pages, 4 figures) and supplemental material (7 pages, 4 figures)