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(Color online) (a) Laser polarization dependence of SPT peak: (i) no optical pumping, (ii) σ +, and (iii) σ − illumination. (b) RF modulation dependence of SPT peak: (I) RF off-resonance with 75As, (II) RF on-resonance with 75As, and (III) no optical pumping.
(Color online) (a) Vpeak as a function of illumination time, τpump . (b) The power dependence of Vpeak at 200 s pump time indicated in (a).
(Color online) (a) (A)-(C): SPT peak with σ + illumination for three irradiation positions as shown in inset. (D): SPT peak without optical pumping. Curves are offset for clarity. (b) Coincidence of ν at peak between σ + illumination at 6.6 T and no optical pumping at 7.9 T. Curves are offset for clarity.
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