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During the pumping for Ti =60s, nuclear polarization diffuses to √ D Ti ∼24nm (see discussion in Sec. ). However, the profile in the close vicinity of X ≈ Xi is rather dominated by the distribution of the directly pumped polarization.
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During the pumping for T i = 60 s, nuclear polarization diffuses to √ D T i ∼ 24 nm (see discussion in Sec.). However, the profile in the close vicinity of X ≈ X i is rather dominated by the distribution of the directly pumped polarization.
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This interpretation is supported by additional experiments not described here: at elevated temperatures up to 500 mK, the backgroundlike component of polarization (in a deeper region of X > X i + 100 nm) is found to increase its amplitude, whereas the component of polarization around X ≈ X i diminishes. These findings indicate that phonon-assisted processes are relevant to the generation of the backgroundlike polarization.
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It would be straightforward to adopt the smallest current (0.1 nA) for simpler interpretation. We chose, however, Ii =±5nA because (i) generated polarization is large enough to be probed in a single-shot measurement and (ii) a broader distribution of polarization enables observation of the decay process at different positions (X).
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It would be straightforward to adopt the smallest current (0.1 nA) for simpler interpretation. We chose, however, I i = ± 5 nA because (i) generated polarization is large enough to be probed in a single-shot measurement and (ii) a broader distribution of polarization enables observation of the decay process at different positions (X).
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