Year: 2026
Type: article
Abstract: We demonstrate single-spin spectroscopy of a fluorescent tumbling defect in silicon called the "G center," behaving as a pseudomolecule randomly reorienting itself in the crystalline matrix. Using high-resolution spin spectroscopy, we reveal a fine magnetic structure resulting from the spin principal axes jumping between discrete orientations in the crystal. Modeling the atomic reorientation of the defect shows that spin tumbling induces variations in the coupling to the microwave magnetic field, enabling position-dependent Rabi frequencies to be detected in coherent spin control experiments. By virtue of its pseudomolecule configuration, the G center in silicon is a unique quantum system to investigate the mutual interaction between optical, spin, and rotation properties in a highly versatile material.
Source: Physical Review Letters
DOI: 10.1103/th7k-s7r6
Institutions: Centre National de la Recherche Scientifique, Université de Montpellier, Laboratoire Charles Coulomb, Laboratoire d'Électronique des Technologies de l'Information, Université Grenoble Alpes, Institut polytechnique de Grenoble, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Institut de Recherche Interdisciplinaire de Grenoble, Institut Universitaire de France
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: Formation Quantique Université Grenoble Alpes, G1679945901, G2897843612, G4434090233, G4786631470, W cOlor centers for integrated qUAntum pHotonics, Ordinateurs quantiques à base de lumière en variables discrètes et continues, G8965587046, Laboratory of Alliances on Nanosciences - Energy for the Future
OpenAlex ID: W7167579687