碳纳米管共隧穿谱中的热致亚能隙特征
Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube
摘要：
本文报道了碳纳米管量子点与铌超导接触耦合的非线性共隧穿谱。我们的测量结果显示丰富的subgap功能的稳定性图变得更加明显，随着温度的升高。应用输运理论的基础上的刘维尔-冯诺依曼方程的密度矩阵，我们表明，输运性质可以归因于涉及顺序以及弹性和非弹性cotunneling的准粒子热激发跨越间隙的过程。特别是，我们预测的弹性和非弹性共隧穿峰的热副本，与我们的实验结果一致。
英文摘要：
We report on nonlinear cotunneling spectroscopy of a carbon nanotube quantum dot coupled to Nb superconducting contacts. Our measurements show rich subgap features in the stability diagram which become more pronounced as the temperature is increased. Applying a transport theory based on the Liouville-von Neumann equation for the density matrix, we show that the transport properties can be attributed to processes involving sequential as well as elastic and inelastic cotunneling of quasiparticles thermally excited across the gap. In particular, we predict thermal replicas of the elastic and inelastic cotunneling peaks, in agreement with our experimental results.
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