Berlin 2018 – wissenschaftliches Programm

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SYTH: Symposium Terahertz physics: toward probing and controlling of materials on the nanoscale

SYTH 1: Terahertz Physics: Toward Probing and Controlling of Materials on the Nanoscale

SYTH 1.5: Hauptvortrag

Donnerstag, 15. März 2018, 11:45–12:15, H 0105

Lightwave scanning tunneling microscopy of single molecules — Dominik Peller, Tyler L. Cocker, Ping Yu, Rupert Huber, and •Jascha Repp — Department of Physics, University of Regensburg, 93040 Regensburg, Germany

Combining the concept of lightwave electronics [1] with scanning tunneling microscopy (STM) has enabled femtosecond temporal resolution in STM [2]. In lightwave STM, the electric field of a single-cycle laser pulse acts as a transient bias voltage across an STM junction. This way, the peak of an electric-field waveform could be used to induce tunneling of a single electron from an individual molecule’s orbital [3] within a time window of ≃100 fs – faster than an oscillation cycle of the terahertz laser pulse. This quantum process allows us to capture a microscopic real-space snapshot of the molecular orbital at a sub-Ångstrom spatial resolution and on a sub-cycle time scale. By correlating two successive state-selective tunneling events, we directly track coherent THz vibrations of a single molecule in the time domain [4]. References: [1] E. Goulielmakis et al., Science 317, 769 (2007); [2] T. L. Cocker et al., Nature Photon. 7, 620 (2013); [3] J. Repp et al., Phys. Rev. Lett. 94, 026803 (2005); [4] T. L. Cocker et al., Nature 539, 263 (2016).