Optical pump-probe scanning tunneling microscopy for probing ultrafast dynamics on the nanoscaleS. Yoshida, Y. Terada, M. Yokota, O. Takeuchi, H. Oigawa and H. ShigekawaEur. Phys. J. Special Topics, 222 5 (2013) 1161-1175DOI: https://doi.org/10.1140/epjst/e2013-01912-2