Coherent electrical manipulation of nuclear spins in semiconductors

We have utilized the electron–nuclear spin interaction in quantum-Hall edge channels for manipulating local nuclear spins in semiconductors. Nuclear spins in a limited region along spin-resolved quantum-Hall edge channels are strongly polarized through the hyperfine interaction. Quantum states of the nuclear spins evolve coherently during a pulsed-mode application of RF magnetic field generated by a built-in micro-metal strip. The final nuclear-spin state reached after the pulsed-mode operation is read out by the edge-channel transport. The amplitude of nuclear magnetic resonance oscillates as a function of the pulse duration, i.e. the Rabi oscillation of nuclear spins in semiconductor devices.