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arXiv 0810.1308cond-mat.mes-hallcond-mat.str-el
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碳纳米管的非平衡隧道能谱

Non-equilibrium Tunneling Spectroscopy in Carbon Nanotubes

Yung-Fu Chen, Travis Dirks, Gassem Al-Zoubi, Norman Birge, Nadya Mason

摘要:

我们报告的碳纳米管中的非平衡电子能量分布的测量。使用隧道光谱通过超导探针,我们研究的形状的本地电子分布函数,因此能量弛豫率,在纳米管,有偏置电压施加在它们的两端之间。在低温下,电子在几微米通道长度的纳米管中相互作用很弱,与端到端电导值无关。令人惊讶的是,当温度升高到仅1.5K时,能量弛豫速率可以显著增加。

英文摘要:

We report measurements of the non-equilibrium electron energy distribution in carbon nanotubes. Using tunneling spectroscopy via a superconducting probe, we study the shape of the local electron distribution functions, and hence energy relaxation rates, in nanotubes that have bias voltages applied between their ends. At low temperatures, electrons interact weakly in nanotubes of a few microns channel length, independent of end-to-end conductance values. Surprisingly, the energy relaxation rate can increase substantially when the temperature is raised to only 1.5 K.

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