Pawłowski J, Szumniak P, Skubis A, Bednarek S
Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland.
J Phys Condens Matter. 2014 Aug 27;26(34):345302. doi: 10.1088/0953-8984/26/34/345302. Epub 2014 Aug 8.
A nanodevice capable of separating spins of two electrons confined in a quantum dot formed in a gated semiconductor nanowire is proposed. Two electrons confined initially in a single quantum dot in the singlet state are transformed into the system of two electrons confined in two spatially separated quantum dots with opposite spins. In order to separate the electrons' spins we exploit transitions between the singlet and the triplet state, which are induced by resonantly oscillating Rashba spin-orbit coupling strength. The proposed device is all electrically controlled and the electron spin separation can be realized within tens of picoseconds. The results are supported by solving numerically the quasi-one-dimensional time-dependent Schroedinger equation for two electrons, where the electron-electron correlations are taken into account in the exact manner.
提出了一种纳米器件，它能够分离限制在门控半导体纳米线中形成的量子点内的两个电子的自旋。最初限制在单重态单个量子点中的两个电子被转换为限制在两个空间分离的具有相反自旋的量子点中的两个电子的系统。为了分离电子自旋，我们利用由共振振荡的 Rashba 自旋 - 轨道耦合强度诱导的单重态和三重态之间的跃迁。所提出的器件完全由电控制，并且电子自旋分离可以在几十皮秒内实现。通过精确求解两个电子的准一维含时薛定谔方程（其中以精确方式考虑了电子 - 电子相关性），这些结果得到了支持。
