Resonant nuclear spin cooling by holes in MAPbI3 is shown through Hanle curves that shift with modulation frequency, indicate 207Pb nuclei, and point to strongly localized holes as the cooling agents.
Resonant optical cooling of nuclear spins in case of strong Knight field of photoexcited electrons
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abstract
Resonant cooling of the nuclear spin system of a semiconductor by spin-polarized charge carriers under pumping with helicity-modulated polarized light is considered theoretically. It is shown that in the case of strong Knight field of charge carriers, exceeding local fields of the dipole-dipole interaction of nuclear spins, the Overhauser field arising as a result of resonant cooling can considerably modify the overall shape of magnetic-field dependences of charge carrier spin polarization, experimentally observed as the Hanle effect.
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Resonant cooling of nuclear spins by optically-oriented holes in MAPbI$_3$ perovskite crystals
Resonant nuclear spin cooling by holes in MAPbI3 is shown through Hanle curves that shift with modulation frequency, indicate 207Pb nuclei, and point to strongly localized holes as the cooling agents.