Switching of a coupled spin pair in a single-molecule junction.
Switching of a coupled spin pair in a single-molecule junction.
复制标题
DOI：
10.1038/nnano.2013.133
复制
发表时间：
2013-08
影响因子：
38.3
通讯作者：
Stefan Wagner;F. Kisslinger;Stefan Ballmann;F. Schramm;Rajadurai Chandrasekar;Tilmann Bodenstein;O. Fuhr;Daniel Secker;K. Fink;M. Ruben;H. B. Weber
中科院分区：
文献类型：
--
作者：
Stefan Wagner;F. Kisslinger;Stefan Ballmann;F. Schramm;Rajadurai Chandrasekar;Tilmann Bodenstein;O. Fuhr;Daniel Secker;K. Fink;M. Ruben;H. B. Weber
单分子自旋电子学研究通过具有内部自旋自由度的磁性分子的电子输运。为了理解和控制这些单个分子，读取它们的自旋状态是很重要的。对于未成对自旋，近藤效应已被观察到，作为一个低温异常在小电压。在这里，我们表明，在一个单一的磁性分子耦合自旋对可以被检测到，并且可以使用一个偏置电压之间切换的分子的两个状态。特别是，我们使用的机械控制断开结技术来测量电子输运通过一个单分子结包含两个耦合的自旋中心，被限制在两个钴离子。用自旋轨道组态相互作用方法计算了组合自旋系统，发现基态为赝单重态，第一激发态为赝三重态。实验上，这些状态可以被分配到一个Kondo的零偏异常的低温电导数据的情况下，发生，分别。通过施加有限偏压，我们可以在伪单重态和伪三重态之间反复切换。
Single-molecule spintronics investigates electron transport through magnetic molecules that have an internal spin degree of freedom. To understand and control these individual molecules it is important to read their spin state. For unpaired spins, the Kondo effect has been observed,,,,,as a low-temperature anomaly at small voltages. Here, we show that a coupled spin pair in a single magnetic molecule can be detected,and that a bias voltage can be used to switch between two states of the molecule. In particular, we use the mechanically controlled break-junction technique to measure electronic transport through a single-molecule junction containing two coupled spin centres that are confined on two Co2+ions. Spin–orbit configuration interaction methods are used to calculate the combined spin system, where the ground state is found to be a pseudo-singlet and the first excitations behave as a pseudo-triplet. Experimentally, these states can be assigned to the absence and occurrence of a Kondo-like zero-bias anomaly in the low-temperature conductance data, respectively. By applying finite bias, we can repeatedly switch between the pseudo-singlet state and the pseudo-triplet state.