A photoluminescence (PL) and magnetic resonance investigation of a defect in chlorine-implanted 4H-SiC is presented. This Cl-related center emits light at telecom wavelengths with zero-phonon lines in the range 1350-1540 nm. Its four configurations exhibit stable PL spectra characterized by narrow zero-phonon lines. For the two configurations that emit light at the C-band, a Debye-Waller factor in the range 22-25% is estimated. Optically detected magnetic resonance confirms that the Cl-related center is spin active and stable at room temperature with the zero-field splitting in the range of 1.0-1.4 GHz. The combined optical and spin properties suggest this center to be a highly promising candidate for scalable quantum networks.
@article{arxiv.2602.08854,
title = {Spin-active chlorine-related centers in 4H-SiC with telecom-band emissions},
author = {Danial Shafizadeh and Misagh Ghezellou and Viktor M. Bobal and Lasse Vines and Jawad Ul-Hassan and Valdas Jokubavicius and Nguyen T. Son and Ivan G. Ivanov},
journal= {arXiv preprint arXiv:2602.08854},
year = {2026}
}