论文标题
来自交叉石墨烯纳米纤维的自旋极化电子束分离器
Spin-polarizing electron beam splitter from crossed graphene nanoribbons
论文作者
论文摘要
理论上已经提出了由两个交叉石墨烯纳米纤维（GNR）组成的连接，作为电子束分裂体，其中一个GNR中的传入电子波可以连贯地分成\ emph {两个}爆炸的末端，它们具有几乎相等的振幅和零后筛分。在这里，我们对由狭窄的锯齿形GNR组成的设备进行了审查，以明确考虑库仑排斥的作用，从而导致均极化边缘状态在平均场理论中。我们表明，梁切开效应在众所周知的相关间隙的开放中生存，更令人惊讶的是，出现了\ emph {旋转依赖性}散射势，会旋转两个输出中的传输电子。通过连接几个连接串联可以实现近乎完美的极化。我们的发现表明，GNR是带有干涉和纠缠应用的Spintronics和量子技术中有趣的基础。
Junctions composed of two crossed graphene nanoribbons (GNRs) have been theoretically proposed as electron beam splitters where incoming electron waves in one GNR can be split coherently into propagating waves in \emph{two} outgoing terminals with nearly equal amplitude and zero back-scattering. Here we scrutinize this effect for devices composed of narrow zigzag GNRs taking explicitly into account the role of Coulomb repulsion that leads to spin-polarized edge states within mean-field theory. We show that the beam-splitting effect survives the opening of the well-known correlation gap and, more strikingly, that a \emph{spin-dependent} scattering potential emerges which spin-polarizes the transmitted electrons in the two outputs. A near-perfect polarization can be achieved by joining several junctions in series. Our findings suggest that GNRs are interesting building blocks in spintronics and quantum technologies with applications for interferometry and entanglement.
