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The effect of exchange interactions within spin pairs on spin-dependenttransport and recombination rates through localized states in semiconductorsduring coherent electron spin resonant excitation is studied theoretically. Itis shown that for identical spin systems, significant quantitative differencesare to be expected between the results of pEDMR/pODMR experiments werepermutation symmetry is the observable as compared to pESR experiments withpolarization as the observable. It is predicted that beat oscillations of thespin nutations and not the nutations themselves dominate the transport orrecombination rates when the exchange coupling strength or the field strengthof the exciting radiation exceed the difference of the Zeeman energies withinthe spin pair. Furthermore, while the intensities of the rate oscillationsdecrease with increasing exchange within the spin pairs, the singlet andtriplet signals retain their relative strength. This means that pEDMR and pODMRexperiments could allow better experimental access to ESR forbidden singlettransitions which are hardly or not at all accessible with conventional pulsedelectron spin resonance spectroscopy.

Spin-dependent transition rates through exchange coupled localized spin pairs during coherent spin excitation