论文标题
由弯曲的石墨烯纳米替恩的绝热量子泵送由扭结驱动
Adiabatic quantum pumping in buckled graphene nanoribbon driven by a kink
论文作者
论文摘要
我们提出了一种新型的量子泵，中屈曲的石墨烯纳米替比，它是由沿色带移动的扭结驱动的。从实际的角度来看，与栅极驱动的泵相比，带有移动散射器的泵具有优势，例如每个循环的充电转移增强。通过使用经典$ ϕ^4 $模型解决方案截断碳原子的空间排列来简化扭结几何形状，其中包括从碳纳米结构的Su-Schrieffer-Heeger模型中进行的宽度重新归一化。我们以数字证明作为概念证明，对于中等变形，色带中心的固定扭结可能会阻止外部电压偏置驱动的电流。在没有偏置的情况下，移动的扭结会导致高效的泵效应，每单位循环的电荷取决于门电压。
We propose a new type of quantum pump in buckled graphene nanoribbon, adiabatically driven by a kink moving along the ribbon. From a practical point of view, pumps with moving scatterers present advantages as compared to gate-driven pumps, like enhanced charge transfer per cycle per channel. The kink geometry is simplified by truncating the spatial arrangement of carbon atoms with the classical $ϕ^4$ model solution, including a width renormalization following from the Su-Schrieffer-Heeger model for carbon nanostructures. We demonstrate numerically, as a proof of concept, that for moderate deformations a stationary kink at the ribbon center may block the current driven by the external voltage bias. In the absence of a bias, a moving kink leads to highly-effective pump effect, with a charge per unit cycle dependent on the gate voltage.
