Zhang Zhengzhong, Wang Ya, Wang Haiou, Liu Hao, Dong Liming
Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian, China.
School of mechanical engineering and information, Shanghai Urban Construction Vocational College, Shanghai, China.
Nanoscale Res Lett. 2021 May 1;16(1):77. doi: 10.1186/s11671-021-03531-0.
A new type of spin-current filter is proposed that consists of a single-molecule magnet (SMM) coupled to two normal metal electrodes. It is shown that this tunneling junction can generate a highly spin-polarized current, whose spin polarization can be switched by means of magnetic fields and gate voltages applied to the SMM. This spin switching in the SMM tunnel junction arises from spin-selective single-electron resonant tunneling via the lowest unoccupied molecular orbit of the SMM. The electron current spectrum is still spin polarized in the absence of an external magnetic field, which can help to judge whether the molecule's spin state has reached the ground-state doublet [Formula: see text]. This device can be realized with current technologies and may have practical use in spintronics and quantum information.
提出了一种新型的自旋电流滤波器，它由一个与两个普通金属电极耦合的单分子磁体（SMM）组成。结果表明，这种隧道结可以产生高度自旋极化的电流，其自旋极化可以通过施加到SMM上的磁场和栅极电压来切换。SMM隧道结中的这种自旋切换源于通过SMM的最低未占据分子轨道的自旋选择性单电子共振隧穿。在没有外部磁场的情况下，电子电流谱仍然是自旋极化的，这有助于判断分子的自旋态是否已达到基态双重态[公式：见正文]。这种器件可以用当前技术实现，并且可能在自旋电子学和量子信息中有实际应用。
