通过碳纳米管结的可逆热流
Reversable heat flow through the carbon nanotube junctions
摘要：
从理论上研究了碳纳米管结（NJ）外控可逆热流的微观机制。我们的模型表明，热沿管段${\cal T}$由电子（$e$）和空穴（$h$）沿平行或相反方向弹道运动，并由偏置源漏电压$V_{\rm SD}$加速（Peltier效应）。我们计算了Seebeck系数$α$，电$σ$和热$κ$电导率，发现它们的大小强烈地依赖于$V_{\rm SD}$和$V_{\rm G}$ . $α$与以前实验观察到的$V_{\rm G}$的符号相反，在这项工作中被解释为所谓的手征隧穿现象（克莱因悖论）。
英文摘要：
Microscopic mechanisms of externally controlled reversable heat flow through the carbon nanotube junctions (NJ) are studied theoretically. Our model suggests that the heat is transfered along the tube section ${\cal T}$ by electrons ($e$) and holes ($h$) moving ballistically in either in parallel or in opposite directions and accelerated by the bias source-drain voltage $V_{\rm SD}$ (Peltier effect). We compute the Seebeck coefficient $α$, electric $σ$ and thermal $κ$ conductivities and find that their magnitudes strongly depend on $V_{\rm SD}$ and $V_{\rm G}$. The sign reversal of $α$ versus the sign of $V_{\rm G}$ formerly observed experimentally is interpreted in this work in terms of so-called chiral tunneling phenomena (Klein paradox).
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