Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: Overview Talk: Jascha Repp

O 10.1: Hauptvortrag

Montag, 20. März 2017, 15:00–15:45, TRE Phy

Overview of the development of ultrafast scanning tunneling microscopy — Dominik Peller, Tyler L. Cocker, Ping Yu, Rupert Huber, and •Jascha Repp — Department of Physics, University of Regensburg, 93040 Regensburg, Germany

Since the early days of scanning tunneling microscopy (STM) people have tried to combine atomic-scale resolution with an ultrafast temporal resolution [1]. Recently time-dithering optical pulse pairs has minimized the deleterious effect of light-induced heating [2] and hot-electron transfer has been demonstrated with sub-molecular resolution [3]. An all-electronic pump-probe scheme [4] has allowed for a direct observation of the relaxation of individual spins at the nanosecond timescale. Cocker et al. [5] were the first to use terahertz (THz) pulses acting analogously to voltage pulses accessing much shorter timescales. Recently, THz-STM enabled a novel, state-selective regime, in which a single electron can be selectively removed from a specific molecular orbital at combined sub-Ångstrom and sub-picosecond resolution [6].

[1] Hamers and Cahill, Appl. Phys. Lett. 57, 2031 (1990); Nunes and Freeman, Science 262, 1029 (1993) [2] Terada, Yoshida, Takeuchi and Shigekawa, Nature Photon. 4, 869 (2010); Yoshida et al., Nature Nano. 9, 588 (2014) [3] Wu and Ho, Phys. Rev. B 82, 085444 (2010) [4] Loth et al., Science 329, 1628 (2010) [5] Cocker et al., Nature Photon. 7, 620 (2013) [6] Cocker et al., Nature 539, 263 (2016).