Schematic image of conversion from single photons to single electron spins in a double quantum dot with photon irradiation. Charge and spin of the single photoelectron are sensitively detected by a nearby quantum dot as a charge detector.
We have synthesized new ferromagnetic semiconductor GaCrN. Curie temperature is above 130℃. Tunnel magneto-resistance effect was also observed. GaCrN is promising for semiconductor spintronics.