All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime

摘要

Resonant cooling of different nuclear isotopes manifested inoptically-induced nuclear magnetic resonances (NMR) is observed in n-dopedCdTe/(Cd,Mg)Te and ZnSe/(Zn,Mg)Se quantum wells and for donor-bound electronsin ZnSe:F and GaAs epilayers. By time-resolved Kerr rotation used in the regimeof resonant spin amplification we can expand the range of magnetic fields wherethe effect can be observed up to nuclear Larmor frequencies of 170 kHz. Themechanism of the resonant cooling of the nuclear spin system is analyzedtheoretically. The developed approach allows us to model the resonant spinamplification signals with NMR resonances.