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O: Fachverband Oberflächenphysik
O 103: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation IV
O 103.4: Talk
Friday, March 22, 2024, 11:30–11:45, HE 101
Thermal with electronic excitation for unidirectional rotation of molecule on surface — •Kwan Ho Au-Yeung1,2, Suchetana Sarkar1, Christian Joachim3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Physikalisches Institut, Karlsruhe Institute of Technology, 76131Karlsruhe, Germany — 3GNS & MANA Satellite, CEMES, CNRS, 29 rue J. Marvig, 31055 Toulouse, France
Exploring the limits of the microscopic reversibility principle, we investigated the interplay between thermal and electron tunneling excitations for the unidirectional rotation of a molecule-rotor on the Au(111) surface. We identified a range of moderate voltages and temperatures where heating the surface enhances the unidirectional rotational rate of a chemisorbed DMNI-P rotor. When manipulated by voltage pulses, the rotational processes are predominantly governed by inelastic tunneling effects. Conversely, at increased temperatures, the rotation adopts a stochastic character. At each electron transfer event during tunneling, the quantum mixing of ground and excited electronic states brings part of the thermal energy in the excited electronic states of the rotor.
Keywords: Scanning tunneling microscope; Tunneling electron; Molecular machine; Thermal energy; Molecular manipulation