Gate-controlled nuclear magnetic resonance in an AlGaAs/GaAs quantum   Hall device
  We study the resistively detected nuclear magnetic resonance (NMR) in an AlGaAs/GaAs quantum Hall device with a side gate. The strength of the hyperfine interaction between electron and nuclear spins is modulated by tuning a position of the two-dimensional electron systems with respect to the polarized nuclear spins using the side-gate voltages. The NMR frequency is systematically controlled by the gate-tuned technique in a semiconductor device. 
S. Masubuchi, K. Hamaya, T. Machida