SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Focus Session: Ultrafast Dynamics in Nanostructures I
O 75.5: Topical Talk
Donnerstag, 30. März 2023, 11:45–12:15, GER 38
Lightwave-driven scanning tunneling microscopy and spectroscopy at the atomic scale — •Vedran Jelic1, Spencer E. Ammerman1, Yajing Wei1, Vivian N. Breslin1, Mohammed Hassan1, Nathan Everett1, Sheng Lee1, Stephanie Adams1, Trevor Hickle1, Kaedon Cleland-Host1, Qiang Sun2, Carlo A. Pignedoli2, Pascal Ruffieux2, Roman Fasel2,3, and Tyler L. Cocker1 — 1Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA — 2Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland — 3Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
Lightwave-driven scanning tunneling microscopy is a new technique for studying atomic-scale surfaces that exhibit sub-picosecond dynamics. By coupling free-space-propagating single-cycle terahertz pulses to an atomically sharp metal tip, lightwave-driven microscopy can achieve simultaneous sub-angstrom and sub-picosecond spatio-temporal resolution. We utilize terahertz scanning tunneling microscopy (THz-STM) to investigate seven-atom-wide graphene nanoribbons on an Au(111) surface and unveil highly localized wavefunctions that are inaccessible with conventional STM. Three-dimensional tomographic THz-STM imaging of the electron densities reveals a faster spatial decay of the valance band compared to the conduction band. Additionally, an algorithm is introduced for extracting the underlying differential conductance from THz-STS measurements in both steady-state and pump-probe scenarios.