Strong spin-dependent negative differential resistance in composite graphene superlattices
Strong spin-dependent negative differential resistance in composite graphene superlattices
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DOI：
10.1103/physrevb.88.155423
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发表时间：
2013-10-17
影响因子：
3.7
通讯作者：
Dominguez-Adame, F.
中科院分区：
文献类型：
--
作者：
Munarriz, J.;Gaul, C.;Dominguez-Adame, F.
在由石墨烯纳米带和沉积在其上的一组铁磁绝缘体条组成的复合系统中，我们发现了自旋相关负差分电阻的明显特征。铁磁条的周期性阵列诱导石墨烯中电子态的邻近交换分裂，导致具有自旋依赖能谱的超晶格的出现。通过该器件的电流可以是高度极化的，并且电流及其极化都与偏置电压呈非单调依赖关系。因此，该器件作为Esaki自旋二极管工作，这为设计新的自旋电子电路提供了可能性。
We find clear signatures of spin-dependent negative differential resistance in compound systems comprising a graphene nanoribbon and a set of ferromagnetic insulator strips deposited on top of it. The periodic array of ferromagnetic strips induces a proximity exchange splitting of the electronic states in graphene, resulting in the appearance of a superlattice with a spin-dependent energy spectrum. The electric current through the device can be highly polarized and both the current and its polarization manifest nonmonotonic dependence on the bias voltage. The device operates therefore as an Esaki spin diode, which opens possibilities to design new spintronic circuits.