论文标题
曲折边缘状态对有限石墨烯纳米骨的热电特性的影响
Effects of zigzag edge states on the thermoelectric properties of finite graphene nanoribbons
论文作者
论文摘要
理论上在紧密结合模型和Green的功能方法的框架中研究了有限石墨烯纳米纤维（GNR）（GNRS）（GNRS）的热电性能。当锯齿形侧面耦合到电极时，仅当电极之间的通道长度小于这些局部锯齿形边缘状态的衰减长度时，通过局部边缘状态的电子传输才会发生。当扶手椅边缘耦合到电极时，当GNR处于半导体阶段时，与中间隙状态相关的热电学行为有一个有趣的热电行为。在这里，我们表明，具有连接到电极的扶手椅侧的GNR的锯齿形边缘状态的热电行为与具有相似轨道退化的两个平行量子点相似。此外，证明由锯齿形边缘态给出的电导和功率因数与缺陷散射相当强大。
Thermoelectric properties of finite graphene nanoribbons (GNRs) coupled to metallic electrodes are theoretically studied in the framework of tight-binding model and Green's function approach. When the zigzag sides are coupled to the electrodes, the electron transport through the localized edge states can occur only if the channel length between electrodes is smaller than the decay length of these localized zigzag edge states. When the armchair edges are coupled to the electrodes, there is an interesting thermoelectric behavior associated with the mid-gap states when the GNR is in the semiconducting phase. Here we show that the thermoelectric behavior of zigzag edge states of GNRs with armchair sides connected to electrodes is similar to that of two parallel quantum dots with similar orbital degeneracy. Furthermore, it is demonstrated that the electrical conductance and power factor given by the zigzag edge states are quite robust against the defect scattering.
