Spin blockade from spin channel to quantum dots and its application to qubit

通过热力学计算研究了铁电极与InAs衬底的表面反应。我们制作了一个铁电极自旋晶体管，并验证了电流振荡与理论计算符合得很好。我们还制作了一个基于Au胶体的InAs纳米线自旋晶体管，并观察到电流振荡，这可能是源于自旋-轨道相互作用。在自旋晶体管/量子点混合结构中，我们已经从理论上证明了40%的自旋极化将难以验证量子纠缠，但在60%的自旋极化下，它将是相当大的信号，并且在80%的自旋极化下，在自旋通道中可以观察到清晰的纠缠。

We have investigated surface reaction of Fe electrode and InAs substrate by thermodynamic calculation. We have fabricated a spin transistors with Fe electrode and verified current oscillation which agreed well with theoretical calculation. We have also fabricated an InAs nanowire spin transistor based on Au colloid and observed current oscillation which is presumably originates from spin-orbit interaction. In a spintransistor/quantum dot hybrid structure, we have theoretically demonstrated that spin polarization of 40% would be hard to verify quantum entanglement, but it would be appreciably large signal with 60% spin polarization and clear entanglement would be observable with 80% spin polarization in the spin channel.