Figure 1

(a) Spin-dependent recombination step from the ${}^{31}\mathrm{P}$ donor to the $P_{b0}$ center. In contrast, the recombination in (b) involves conduction band electrons which spin-dependently recombine with ${}^{31}\mathrm{P}$ and $P_{b0}$ not involving a direct transition between ${}^{31}\mathrm{P}$ and $P_{b0}$. (c) Pulse scheme used in the multifrequency pump-probe experiment. For the direct recombination involving ${}^{31}\mathrm{P}$ and $P_{b0}$, panel (d) depicts the expected Rabi oscillations in the recombination rate induced by a probe pulse with length ${\tau }_2$ on the $P_{b0}$ spin system for two different starting conditions when no pump pulse and when a $\pi$-pump pulse has been applied to the ${}^{31}\mathrm{P}$ spin system.Reuse & Permissions

Figure 2

(a) Swept-field cw EDMR spectrum of the relative current change $\Delta I/I$ (black line) at 6 K showing the two ${}^{31}\mathrm{P}$ hyperfine lines (red [medium gray]) and the two $P_{b0}$ lines (blue [dark gray] and green [light gray]). The colored lines are fits using a derivative Lorentzian line shape. In (b), Rabi oscillations of the $P_{b0}$ spins for several flipping angles of the first pulse on both ${}^{31}\mathrm{P}$ resonances in multiples of $\pi$ are depicted. The Rabi oscillations for ${\tau }_1\equiv \pi$ and ${\tau }_1\equiv 3\pi$ are inverted (solid red [medium gray] lines) as expected for a spin-dependent recombination involving these two spin species.Reuse & Permissions

Figure 3

Panel (a) shows the amplitude $\delta Q$ of the Rabi oscillations on the $P_{b0}$ spins vs the pulse length ${\tau }_1$ of the pump pulse on both ${}^{31}\mathrm{P}$ resonances (black squares) and on the high-field ${}^{31}\mathrm{P}$ resonance only (red dots). The solid lines are fits with an exponentially damped cosine plus a linear background (black dotted line for excitation of both ${}^{31}\mathrm{P}$ resonances). (b) Rabi oscillations excited on both ${}^{31}\mathrm{P}$ hyperfine lines without subsequent probe pulse. (c) Comparison of $\delta Q$ for pumping on both ${}^{31}\mathrm{P}$ lines (black) and on the $P_{b0}$ resonance (red). (d) Amplitude $\delta Q$ of the Rabi oscillations on the $P_{b0}$ spins as a function of the microwave $B_1$ field amplitude of $\pi$ and $2\pi$ pump pulses on both ${}^{31}\mathrm{P}$ hyperfine lines. The dashed line is a numerical simulation taking power broadening effects into account.Reuse & Permissions