Details

Autor(en) / Beteiligte

• Whiteley, Samuel J.
• Wolfowicz, Gary
• Anderson, Christopher P.
• Bourassa, Alexandre
• Ma, He
• Ye, Meng
• Koolstra, Gerwin
• Satzinger, Kevin J.
• Holt, Martin V.
• Heremans, F. Joseph
• Cleland, Andrew N.
• Schuster, David I.
• Galli, Giulia
• Awschalom, David D.

Titel

Spin–phonon interactions in silicon carbide addressed by Gaussian acoustics

Ist Teil von

• Nature physics, 2019-05, Vol.15 (5), p.490-495

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Nature

Beschreibungen/Notizen

• Hybrid spin–mechanical systems provide a platform for integrating quantum registers and transducers. Efficient creation and control of such systems require a comprehensive understanding of the individual spin and mechanical components as well as their mutual interactions. Point defects in silicon carbide (SiC) offer long-lived, optically addressable spin registers in a wafer-scale material with low acoustic losses, making them natural candidates for integration with high-quality-factor mechanical resonators. Here, we show Gaussian focusing of a surface acoustic wave in SiC, characterized using a stroboscopic X-ray diffraction imaging technique, which delivers direct, strain amplitude information at nanoscale spatial resolution. Using ab initio calculations, we provide a more complete picture of spin–strain coupling for various defects in SiC with C3v symmetry. This reveals the importance of shear strain for future device engineering and enhanced spin–mechanical coupling. We demonstrate all-optical detection of acoustic paramagnetic resonance without microwave magnetic fields, relevant for sensing applications. Finally, we show mechanically driven Autler–Townes splittings and magnetically forbidden Rabi oscillations. These results offer a basis for full strain control of three-level spin systems.The authors use surface acoustic waves, focused in a Gaussian geometry, to manipulate the spin state of divacancy defects in silicon carbide via mechanical driving. They demonstrate that shear strain is important in controlling the spin transitions.