SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: Focus Session: Progress in Hybrid Phononic Quantum Technologies I

HL 3.5: Invited Talk

Monday, March 27, 2023, 11:30–12:00, POT 151

Control of spin centers in silicon carbide using acoustic fields — •Alberto Hernández-Mínguez — Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany

Atom-like color centers in solids are attractive for applications in quantum technologies because their spin states exhibit long coherence times and can be controlled by optical, microwave and acoustic fields. In this contribution, we report on acoustically driven spin transitions in silicon vacancy centers in SiC. Specifically, we use the dynamic strain of surface acoustic waves to selectively excite room-temperature spin transitions with magnetic quantum number differences of ± 1 and ± 2 in the absence of external microwave fields [1]. Compared to the ground states, spin levels in the optically accessible excited states possess even stronger interaction with acoustic vibrations, thus giving rise to novel and, so far, largely unexploited physical phenomena. A remarkable example is the acoustically induced coherent spin trapping [2], which consists in the quenching of the optically detected spin resonance due to the precession of the spin around the same axis in both ground and excited states. Our findings provide new opportunities for the coherent control of spin qubits with dynamic strain fields that can lead towards the realization of future spin-acoustic quantum devices.

[1] A. Hernández-Mínguez et al., Phys. Rev. Lett. 125, 107702 (2020)

[2] A. Hernández-Mínguez et al., Sci. Adv. 7, eabj5030 (2021)