Electric field controllable magnetic coupling of localized spins mediated by itinerant electrons: a toy model,Physical Chemistry Chemical Physics

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Electric field controllable magnetic coupling of localized spins mediated by itinerant electrons: a toy model
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-08-31 00:00:00 , DOI: 10.1039/c7cp03872k
Andrew Palii _{1,

2,

3,

4,

5} , Sergey Aldoshin _{1,

2,

3} , Boris Tsukerblat _{6,

7,

8,

9} , Juan Modesto Clemente-Juan _{10,

11,

12,

13} , Alejandro Gaita-Ariño _{10,

11,

12,

13} , Eugenio Coronado _{10,

11,

12,

13}

Affiliation

In this paper, we propose a toy model to describe the magnetic coupling between the localized spins mediated by the itinerant electron in partially delocalized mixed-valence (MV) systems. This minimal model takes into account the key interactions that are common for all such systems, namely, electron transfer in the valence-delocalized moiety and magnetic exchange between the localized spins and the delocalized electrons. The proposed descriptive model is exactly solvable which allows us to qualitatively and quantitatively discuss the main features of the whole class of partially delocalized MV systems. In the case of relatively strong exchange coupling, the combined action of these two interactions is shown to give rise to a specific kind of double exchange coupling termed here as “external core” double exchange. In the opposite case of relatively strong electron transfer, the general Hamiltonian is shown to be reduced to the effective Hamiltonian of indirect exchange of the localized spins. We argue a possibility to efficiently control the magnetic coupling of the localized spins using an external electric field acting on the delocalized part of the system. Finally, we discuss the perspectives of the present model for molecular spintronics and spin qubits.

中文翻译：

巡回电子介导的局部自旋的电场可控磁耦合：玩具模型

在本文中，我们提出了一个玩具模型来描述在局部离域混合价（MV）系统中由巡回电子介导的局部自旋之间的磁耦合。这个最小的模型考虑了所有此类系统共有的关键相互作用，即，价键离域部分中的电子转移以及局部自旋与离域电子之间的磁交换。所提出的描述模型是完全可解的，这使我们能够定性和定量地讨论整个部分离域MV系统的主要特征。在相对强的交换耦合的情况下，这两个相互作用的组合作用显示出引起一种特殊类型的双交换耦合，在此称为“外部核心”双交换。在相对强的电子转移的相反情况下，一般的哈密顿量被证明简化为局部自旋的间接交换的有效哈密顿量。我们认为有可能通过使用作用于系统离域部分的外部电场有效地控制局部自旋的磁耦合。最后，我们讨论了分子自旋电子学和自旋量子位本模型的观点。

更新日期：2017-09-20

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