论文标题
由移动的扭结和量子标准安培驱动的绝热泵送纳米替烯
Adiabatic pumping driven by moving kink and quantum standard ampere in buckled graphene nanoribbon
论文作者
论文摘要
在数值上讨论了带有扶手椅边缘的弯曲石墨烯色带中的量子泵。通过求解Su-Schrieffer-Heeger模型并执行量子传输的计算机模拟，我们发现扭结沿金属色带的绝热移动会导致高效泵送，并且每个脉动过渡的电荷接近素格烯中Fermi速度确定的最大值。值得注意的是，绝缘纳米替宾在相对较宽的系统参数范围内显示了每个扭结电荷（$ 2E $）的量化值，从而为量子标准安培提供了候选。我们将其归因于存在局部电子状态，并与扭结一起移动，其能量位于色带能量间隙内。
A quantum pump in buckled graphene ribbon with armchair edges is discussed numerically. By solving the Su-Schrieffer-Heeger model and performing the computer simulation of quantum transport we find that a kink adiabatically moving along the metallic ribbon results in highly-efficient pumping, with a charge per kink transition close to the maximal value determined by the Fermi velocity in graphene. Remarkably, insulating nanoribbon show the quantized value of a charge per kink ($2e$) in relatively wide range of the system parameters, providing a candidate for the quantum standard ampere. We attribute it to the presence of a localized electronic state, moving together with a kink, whose energy lies within the ribbon energy gap.
