Takashi Kumagai

Affiliation: Institute for Molecular Science (Japan)

Research Interests: Scanning probe microscopy, Nanoscale optical spectroscopy, Plasmonics, Single-molecule chemistry, Hydrogen dynamics, Molecular electronics

Title: Single-Molecule Switch Utilizing Hydrogen-Bonding Dynamics Plasmonic Cavities

Abstract: Single-molecule switches are fundamental building blocks in molecular electronics. I will discuss single-molecule switching driven by intramolecular double hydrogen transfer (tautomerization), triggered by different reaction pathways such as heat, electrons, mechanical force, light, near-field interactions, and quantum tunneling. Specifically, I will show that for porphycene molecules adsorbed on metal single-crystal surfaces, we can directly observe and control hydrogen-bond dynamics–mediated tautomerization using STM, AFM, and laser excitation techniques. Furthermore, I will discuss how porphycene tautomerization can serve not only as a single-molecule switch based on hydrogen-bond dynamics, but also as a platform for quantum optical and electronic devices that harness the quantum nature of hydrogen nuclei.

Affiliation: Institute for Molecular Science (Japan)

Research Interests: Scanning probe microscopy, Nanoscale optical spectroscopy, Plasmonics, Single-molecule chemistry, Hydrogen dynamics, Molecular electronics

Title: Single-Molecule Switch Utilizing Hydrogen-Bonding Dynamics Plasmonic Cavities

Abstract: Single-molecule switches are fundamental building blocks in molecular electronics. I will discuss single-molecule switching driven by intramolecular double hydrogen transfer (tautomerization), triggered by different reaction pathways such as heat, electrons, mechanical force, light, near-field interactions, and quantum tunneling. Specifically, I will show that for porphycene molecules adsorbed on metal single-crystal surfaces, we can directly observe and control hydrogen-bond dynamics–mediated tautomerization using STM, AFM, and laser excitation techniques. Furthermore, I will discuss how porphycene tautomerization can serve not only as a single-molecule switch based on hydrogen-bond dynamics, but also as a platform for quantum optical and electronic devices that harness the quantum nature of hydrogen nuclei.