Measurement of high electron temperatures in single atom metal point contacts by light emission
Measurement of high electron temperatures in single atom metal point contacts by light emission
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DOI：
10.1063/1.1497188
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发表时间：
2002-08-12
影响因子：
4
通讯作者：
Welland, ME
中科院分区：
文献类型：
--
作者：
Downes, A;Dumas, P;Welland, ME
在扫描隧道显微镜中形成的原子大小的金属接触电流流动过程中，观察到与黑体光谱的光发射。在接触内，电子温度升高到晶格温度以上，因为电子-声子能量转移消失。电子温度高达9000 K推导出稳定的接触光谱。电子能量损失大大减少的一个重要结果是，这些原子尺寸的金属接触的最大电流密度接近10（15）A·m（-2），比宏观导线的电流密度大几个数量级。(C)2002年美国物理学会。
Light emission with a blackbody-like spectrum was observed during current flow through atomic-size metallic contacts formed in the scanning tunneling microscope. Within the contact, the electron temperature rises above the lattice temperature as electron-phonon energy transfer vanishes. Electron temperatures of up to 9000 K were deduced from optical spectroscopy of stable contacts. An important consequence of greatly reduced electron energy losses is that these atomic-size metal contacts have maximum current densities of similar to10(15) A m(-2), several orders of magnitude greater than for macroscopic wires. (C) 2002 American Institute of Physics.