Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Nanostructures at surfaces: 1D and 2D structures and networks I
O 59.7: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, MA 141
Identification and Nanoengineering of Hot Electron-Induced Tautomerization — •Jens Kügel1, Markus Leisegang1, Markus Böhme1, Andreas Krönlein1, Aimee Sixta2, and Matthias Bode1,3 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2University of Texas at Austin, Austin, Texas 78712, United States — 3Wilhelm Conrad Röntgen Center of Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg
The tautomerization of molecules, that is, the bistable position of hydrogen protons within an organic frame, has recently been discussed as a potential avenue toward nanoscale switches. Whereas consensus exists that STM-induced local switching is caused by inelastic electrons that excite vibrational molecular modes [1], the detailed process responsible for nonlocal switching and methods to control this process are largely unknown. Here, we demonstrate for dehydrogenated H2Pc molecules on Ag(111) how to controllably decrease or increase the probability of nonlocal, hot electron-induced tautomerization by Ag nanostructures [2]. We will show that Ag atom walls act as potential barriers that exponentially damp the hot electron current between the injection point and the molecule. Furthermore, by using elliptical nanostructures, we could coherently focus hot electrons onto the molecule, resulting in an almost tripled switching probability.
[1] T. Kumagai et. al., Phys. Lett. 111, 246101 (2013)
[2] J. Kügel et. al., Nano Lett. 17, 5106 (2017)