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(a) Scanning-electron micrograph of a microcoil on top of CdSe/ZnSe QDs. Inner and outer diameter of the coil are and , respectively. (b) Distribution of the longitudinal field component for the microcoil of (a) along a line including the coil center at current calculated from Biot–Savart law for a complete circular loop. (c) PL transient after switching circular polarization orientation of the optical excitation at a current through the microcoil. (d) Amplitude vs field generated by a conventional superconducting magnet (circles) and vs in both current directions (up- and down-triangles), .
Generation and erasure of the electron spin. Upper panel: schematics of optical excitation polarization degree and current pulse. Optical modulation like in Fig. 1 but a smaller coil ( and ) is used in order to produce larger . Lower panel: PL transients observed.
Read-out of the nuclear spin state by electrical current pulses. (a) Pulse schematics for obtaining nuclear spin-up orientation (top), no DNP (middle), and down-orientation (bottom), . (b) Electron spin erasure degree as function of the normalized net pumping rate . and are taken under excitation, i.e., the electron spin is oriented downwards. The same coil as in Fig. 2(b) is used.
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