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High-Fidelity Bidirectional Nuclear Qubit Initialization in SiC

2016; American Physical Society; Volume: 117; Issue: 22 Linguagem: Inglês

10.1103/physrevlett.117.220503

1092-0145

Viktor Ivády, Paul V. Klimov, Kevin C. Miao, Abram L. Falk, David J. Christle, Krisztián Szász, Igor A. Abrikosov, D. D. Awschalom, Ádám Gali,

Atomic and Subatomic Physics Research

Dynamic nuclear polarization (DNP) is an attractive method for initializing nuclear spins that are strongly coupled to optically active electron spins because it functions at room temperature and does not require strong magnetic fields. In this Letter, we theoretically demonstrate that DNP, with near-unity polarization efficiency, can be generally realized in weakly coupled electron spin-nuclear spin systems. Furthermore, we theoretically and experimentally show that the nuclear spin polarization can be reversed by magnetic field variations as small as 0.8 Gauss. This mechanism offers new avenues for DNP-based sensors and radio-frequency free control of nuclear qubits.