Hyperfine-Coupling-Programming of Current through Coupled Quantum Dots with Multiple-Sweep Bias Voltage Waveforms

概要

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Fine features in the leakage current within the two-electron spin blockade region in a weakly coupled vertical double dot device induced on application of a moderate out-of-dot-plane magnetic field (up to 2.5 T) are studied. The nature of these features is consistent with an electron-spin nuclear-spin (hyperfine) interaction origin, and furthermore, their appearance depends strongly on the bias voltage sweep direction through the spin blockade region. Applying multi-part 10 mHz bias voltage waveforms, we can program the total current response via the hyperfine interaction. We demonstrate the operation of shifting a down- (up-) bias sweep through three up- (down-) bias sweeps which leads to a unique outcome in the measured current.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-04-25