Optical pump-probe scanning tunneling microscopy for probing ultrafast dynamics on the nanoscale |
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Authors: | S Yoshida Y Terada M Yokota O Takeuchi H Oigawa H Shigekawa |
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Institution: | 11976. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8571, Japan
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Abstract: | The development of a method for exploring the ultrafast transient dynamics in small organized structures with high spatial resolution is expected to be a basis for further advances in current science and technology. Recently, we have developed a new microscopy technique by combining scanning tunneling microscopy (STM) with ultrashort-pulse laser technology, which enables the visualization of ultrafast carrier dynamics even on the single-atomic level. A nonequilibrium carrier distribution is generated using ultrashort laser pulses and its relaxation processes are probed by STM using the optical pump-probe method realized in STM by the pulse-picking technique. In this paper, the fundamentals of the new microscopy technique are overviewed. |
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