Figure 1: Principle of the spin-filtering enabled nuclear spin hyperpolarization at RT and zero field. | Nature Communications

Figure 1: Principle of the spin-filtering enabled nuclear spin hyperpolarization at RT and zero field.

From: Efficient room-temperature nuclear spin hyperpolarization of a defect atom in a semiconductor

Figure 1

Four possible relative orientations of an e–n spin system with S=1/2 and I=1/2: (a) ↑, (b) ↑, (c) ↓ and (d) ↓. (e) The spin configurations of an e–n spin system with S=1/2 and I=3/2, relevant to the spin-filtering Gai defects in GaNAs. Strong spin polarization of the free conduction-band electrons is generated by the defect-engineered spin-filtering effect. The flow directions of the spin configurations under the influence of SDR and HF coupling are indicated by the dashed arrows. The yellow and blue balls represent the nucleus and electron of a defect, respectively, with the arrows indicating their spin orientations. The conduction-band electrons and valence-band holes are depicted by the grey balls marked by e and h, respectively.

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