With the current progress in manufacturing quantum functions in small organized structures, probing of quantum dynamics with high temporal and spatial resolutions is never more crucial for further advances of nanoscale science and technology.We have developed a microscopy technique that simultaneously realizes the spatial resolution of STM and the temporal resolution of ultrashort-pulse laser technology, optical pump-probe (OPP) method [1-5]. The combination of STM with optical technology has advantages to enable the analysis of photo-induced dynamics on the nanoscale as well as the realization of ultrafast time-resolved microscopy.In OPP-STM, a non-equilibrium carrier distribution is generated using ultrashort laser pulses and its relaxation processes are probed by STM using the OPP method realized in STM. In combination with atom tracking technique, even a single-atomic-level analysis of the carrier dynamics is possible [5]. Furthermore, with the development of a new modulation technique of circularly polarized light, detection of spin dynamics has been realized.Details will be discussed with recent results.[1] Y. Terada, S. Yoshida, O. Takeuchi, and H. Shigekawa: Nat. Photonics 4 (2010) 869.[2] Y. Terada, S. Yoshida, O. Takeuchi, and H. Shigekawa: J. Phys.: Condens. Matter 22 (2010) 264008.[3] S. Yoshida, Y. Terada, R. Oshima, O. Takeuchi, and H. Shigekawa: Nanoscale 4 (2012) 757.[4] S. Yoshida, M. Yokota, O. Takeuchi, Y. Mera, and H. Shigekawa: Appl. Phys. Exp. 6, (2013) 016601.[5] S. Yoshida, M. Yokota, O. Takeuchi, H. Oigawa, Y. Mera, and H. Shigekawa: Appl. Phys. Exp. 6, (2013) 032401.

Time-resolved probe of transient carrier dynamics by optical pump-probe STM

246th National Meeting (2013)

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