Identification and Creation of the Room-Temperature Coherently Controllable ST1 Spin Center in Diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2022-04-27 |
| Journal | ACS Photonics |
| Authors | Tobias LĆ¼hmann, S. Diziain, Jan Meijer, SĆ©bastien Pezzagna |
| Institutions | Leipzig University |
| Citations | 12 |
Abstract
Section titled āAbstractāAmong hundreds of optically active solid-state defects, very few of them hold the promise of spin qubits coherently operating at room temperature. Besides the prominent nitrogen-vacancy (NV) center in diamond, the more recently discovered ST1 center possesses advantageous electronic and spin properties such as a spin-free ground state and a large spin readout contrast (>50%) at 300 K. However, because of its unknown nature, the ST1 center was never created on demand or computed theoretically. Here, we show that both oxygen and the lattice vacancy are constituents of the ST1 center. The involvement of oxygen is unambiguously proved from two independent experiments conducted on two different samples. The creation efficiency of ST1 at 1200 Ā°C annealing is about 10-5 for oxygen implantation of energy 6-50 keV. The addition of vacancies followed by a thermal treatment activate further oxygen into ST1 centers, as it does for native nitrogen into NV centers. Possible ST1 configurations are discussed. The ST1 creation competes with the likely more efficient formation of OV and OVH defects. The controlled fabrication of ST1 and NV centers opens up the way to scalable room-temperature hybrid qubit systems and universal nuclear spin gates.