Smith Luke W, Chen Hong-Bin, Chang Che-Wei, Wu Chien-Wei, Lo Shun-Tsung, Chao Shih-Hsiang, Farrer I, Beere H E, Griffiths J P, Jones G A C, Ritchie D A, Chen Yueh-Nan, Chen Tse-Ming
Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.
Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan.
Phys Rev Lett. 2022 Jan 14;128(2):027701. doi: 10.1103/PhysRevLett.128.027701.
Integrating the Kondo correlation and spin-orbit interactions, each of which have individually offered unprecedented means to manipulate electron spins, in a controllable way can open up new possibilities for spintronics. We demonstrate electrical control of the Kondo correlation by coupling the bound spin to leads with tunable Rashba spin-orbit interactions, realized in semiconductor quantum point contacts. We observe a transition from single to double peak zero-bias anomalies in nonequilibrium transport-the manifestation of the Kondo effect-indicating a controlled Kondo spin reversal using only spin-orbit interactions. Universal scaling of the Kondo conductance is demonstrated, implying that the spin-orbit interactions could enhance the Kondo temperature. A theoretical model based on quantum master equations is also developed to calculate the nonequilibrium quantum transport.
将近藤关联和自旋轨道相互作用整合在一起，这两者各自都提供了前所未有的操控电子自旋的方法，以可控方式进行整合可为自旋电子学开辟新的可能性。我们通过将束缚自旋与具有可调 Rashba 自旋轨道相互作用的引线耦合来证明对近藤关联的电控制，这在半导体量子点接触中得以实现。我们在非平衡输运中观察到从单峰到双峰零偏置异常的转变——这是近藤效应的表现——表明仅使用自旋轨道相互作用就能实现可控的近藤自旋反转。证明了近藤电导的普适标度，这意味着自旋轨道相互作用可以提高近藤温度。还开发了一个基于量子主方程的理论模型来计算非平衡量子输运。
