熵和塞贝克信号在边缘相遇
Entropy and Seebeck signals meet on the edges
摘要：
研究了锯齿形石墨烯带中的电子熵和Seebeck系数$\mathcal{S}$。原始的和边缘掺杂的带被认为是使用紧束缚模型，以检查所观察到的热输运性质的边缘状态的作用。由于带隙开放时，在一个或两个边缘掺杂，由于不对称的边缘电位，我们发现，$s$和$\mathcal{S}$信号是密切相关的彼此：都开发尖锐的倾角峰线形的化学势位于间隙中，而比率$s/\mathcal{S}$表现出一个接近恒定的值等于在低温下的元电荷$e$。这个恒定的比率表明，$\mathcal{S}$可以被看作是每个电荷的传输微分熵，正如一些作者所建议的那样。我们的计算还表明，$s$和$\mathcal{S}$的测量可能是有用的光谱探针的不同的电子能量尺度参与这些数量在带隙材料。
英文摘要：
We explore the electronic entropy per particle $s$ and Seebeck coefficient $\mathcal{S}$ in zigzag graphene ribbons. Pristine and edge-doped ribbons are considered using tight-binding models to inspect the role of edge states in the observed thermal transport properties. As a bandgap opens when the ribbons are doped at one or both edges, due to asymmetric edge potentials, we find that $s$ and $\mathcal{S}$ signals are closely related to each other: both develop sharp dip-peak lineshapes as the chemical potential lies in the gap, while the ratio $s/\mathcal{S}$ exhibits a near constant value equal to the elementary charge $e$ at low temperatures. This constant ratio suggests that $\mathcal{S}$ can be seen as the transport differential entropy per charge, as suggested by some authors. Our calculations also indicate that measurement of $s$ and $\mathcal{S}$ may be useful as a spectroscopic probe of different electronic energy scales involved in such quantities in gapped materials.
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