Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 106: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales IV
O 106.6: Vortrag
Freitag, 22. März 2024, 12:00–12:15, MA 041
Atomic-scale investigation of hot electron dynamics in a single molecule — •Shaoxiang Sheng1, Yang Luo1, Alberto M. Jimenez1, Andrea Schirato2, Guiseppe Dalla Valle2, Guilio Cerullo2, Klaus Kern1,3, and Manish Garg1 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Dipartimento di Fisica - Politecnico di Milano, Milan, Italy — 3Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
The generation and detection of hot electrons have attracted broad attention due to their substantial potential for applications across a wide range of fields1. Extensive studies have been carried out to understand hot electron dynamics in various nanostructures2. Here, we investigate hot electron dynamics by utilizing pump-probe spectroscopy and measuring anti-Stokes emission in the tunnel junction of a scanning tunneling microscope. Our results reveal that the generation of hot electrons is highly localized and their decay in time is energy dependent. We also observe nonlinear four-wave mixing (FWM) signal when the pump and probe pulses overlap in time. Both the hot electron and FWM signals exhibit high sensitivity to the atomic-scale structures and show a large enhancement along the edges of a graphene nanoribbon owing to higher density of the electronic states. This study opens new perspectives in exploiting hot electron induced catalytic reactions in a single molecule and nonlinear optical response in materials at the atomic scales. References: 1. C. Clavero, Nat. Photonics, 8, 95-103 (2015). 2. A. Schirato, et al., Nanophotonics 12, 1-28 (2023).
Keywords: Hot electrons; Four wave mixing; Dynamics; Scanning tunneling microscope