Electric control of a {Fe4} single-molecule magnet in a single-electron transistor
Electric control of a {Fe4} single-molecule magnet in a single-electron transistor
复制标题
单电子晶体管中{Fe4}单分子磁体的电控制
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Pederson
中科院分区：
文献类型：
--
作者：
J. Nossa;M. Islam;C. Canali;M. Pederson
利用第一性原理方法，我们从理论上研究了单个{Fe-4}单分子磁体（SMM）在单电子晶体管几何结构中附着在金属引线上的性质。我们发现，导电引线不影响中性SMM的自旋有序性和磁各向异性。另一方面，铅对分子的带电状态的各向异性有很强的影响，这是在库仑阻塞传输探测。此外，我们证明了一个外部的电势，建模的栅电极，可以用来操纵系统的磁性。对于一个带电的分子，通过本地化的额外的电荷与栅极电压更接近的磁芯，各向异性的大小和自旋排序收敛到孤立的{Fe-4} SMM发现的值。我们比较这些发现与最近的量子输运实验在三端设备的结果。
Using first-principles methods, we study theoretically the properties of an individual {Fe-4} single-molecule magnet (SMM) attached to metallic leads in a single-electron transistor geometry. We show that the conductive leads do not affect the spin ordering and magnetic anisotropy of the neutral SMM. On the other hand, the leads have a strong effect on the anisotropy of the charged states of the molecule, which are probed in Coulomb blockade transport. Furthermore, we demonstrate that an external electric potential, modeling a gate electrode, can be used to manipulate the magnetic properties of the system. For a charged molecule, by localizing the extra charge with the gate voltage closer to the magnetic core, the anisotropy magnitude and spin ordering converges to the values found for the isolated {Fe-4} SMM. We compare these findings with the results of recent quantum transport experiments in three-terminal devices.