Spectroscopic response of photoinduced currents in a laser-assisted scanning tunneling microscope
Spectroscopic response of photoinduced currents in a laser-assisted scanning tunneling microscope
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激光辅助扫描隧道显微镜中光生电流的光谱响应
DOI：
10.1063/1.366216
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
O. Martínez
中科院分区：
文献类型：
--
作者：
A. Bragas;S. Landi;J. Coy;O. Martínez
在分析光生电流时，激光辅助扫描隧道显微镜 (STM) 结点中样品或尖端的热膨胀可能会阻碍对与 STM 与光相互作用相关的其他现象的研究。在本文中，我们表明热贡献与平均隧道电流成正比，这可以用来将其与其他贡献区分开来。对于具有 Pt 尖端的高取向热解石墨和金样品，同时记录了隧道电流 - 电压和光生电流 - 电压曲线。我们对入射光束的两种不同偏振进行了测量。我们证明，I-V 曲线可用于区分产生光生电流的不同机制。在分析光生电流时，激光辅助扫描隧道显微镜 (STM) 结中的样品或尖端的热膨胀可能会阻碍与 STM-光相互作用相关的其他现象的研究。在本文中，我们表明热贡献与平均隧道电流成正比，这可以用来将其与其他贡献区分开来。对于具有 Pt 尖端的高取向热解石墨和金样品，同时记录了隧道电流 - 电压和光生电流 - 电压曲线。我们对入射光束的两种不同偏振进行了测量。我们表明，I-V 曲线可用于区分产生光生电流的不同机制。
Thermal expansion of the sample or tip in a laser-assisted scanning tunneling microscope (STM) junction can obstruct the study of other phenomena related with STM–light interactions, when photoinduced currents are analyzed. In this article, we show that the thermal contribution is proportional to the average tunneling current and that this can be used to distinguish it from other contributions. Simultaneous tunneling current–voltage and photoinduced current–voltage curves are recorded for highly oriented pyrolitic graphite and gold samples with a Pt tip. We have done the measurements for two different polarizations of the incident beam. We show that the I–V curves can be used to discriminate between different mechanisms that appear, producing photoinduced currents.Thermal expansion of the sample or tip in a laser-assisted scanning tunneling microscope (STM) junction can obstruct the study of other phenomena related with STM–light interactions, when photoinduced currents are analyzed. In this article, we show that the thermal contribution is proportional to the average tunneling current and that this can be used to distinguish it from other contributions. Simultaneous tunneling current–voltage and photoinduced current–voltage curves are recorded for highly oriented pyrolitic graphite and gold samples with a Pt tip. We have done the measurements for two different polarizations of the incident beam. We show that the I–V curves can be used to discriminate between different mechanisms that appear, producing photoinduced currents.