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The effect of dipolar and exchange interactions within pairs of paramagneticelectronic states on Pauli-blockade-controlled spin-dependent transport andrecombination rates during magnetic resonant spin excitation is studiednumerically using the superoperator Liouville-space formalism. The simulationsreveal that spin-Rabi nutation induced by magnetic resonance can controltransition rates which can be observed experimentally by pulsed electrically(pEDMR) and pulsed optically (pODMR) detected magnetic resonancespectroscopies. When the dipolar coupling exceeds the difference of the pairpartners' Zeeman energies, several nutation frequency components can beobserved, the most pronounced at sqrt{2} gamma B_1 (gamma is the gyromagneticratio, B_1 is the excitation field). Exchange coupling does not significantlyaffect this nutation component; however, it does strongly influence alow-frequency component < gamma B_1. Thus, pEDMR/pODMR allow the simultaneousidentification of exchange and dipolar interaction strengths.

physical review. b, condensed matter and materials physics

Numerical study of spin-dependent transition rates within pairs of  dipolar and strongly exchange coupled spins with (s=1/2) during magnetic  resonant excitation