Manipulation of nuclear spins in GaAs using a half-metallic spin source of Co2MnSi

Nuclear spins in semiconductors are an ideal system for implementing quantum bits (qubits) for quantum computation because of an extremely long coherence time . Dynamic nuclear polarization (DNP) through hyperfine interaction with electron spins and control of nuclear spin states by nuclear magnetic resonance (NMR) in semiconductors provide basic technologies for implementing nuclear-spin based qubits . A half-metallic ferromagnet could be considered an excellent candidate for a spin source for efficient DNP because it provides complete spin polarization at the Fermi level .