Ultrafast on-demand exciton formation in a single-molecule junction by tailored terahertz pulses
- Type
- Article
- Citation
- Science (New York, N.Y.), v.387, no.6738, pp.1077 - 1082
- Issued Date
- 2025-03
- Abstract
- The ultrafast manipulation of molecular states by charge transfer is essential for characterizing and controlling molecular dynamics. In this study, we demonstrated exciton formation in a single molecule through ultrafast electron tunneling processes between a molecule and a metal tip of a scanning tunneling microscope (STM) using a phase-controlled terahertz (THz) pulse. The pronounced luminescence of the well-defined molecular system under the distinct carrier-envelope phase of the THz pulse revealed that sequential state-selective electron-tunneling processes to the frontier molecular orbitals promoted ultrafast exciton formation in the molecule at the STM junction. Furthermore, ultrafast control of exciton formation was achieved using phase- and delay-controlled THz pulse pairs, providing a route for the regulation of molecular dynamics and the emergence of new molecular functions.
- Publisher
- American Association for the Advancement of Science
- ISSN
- 0036-8075
- Appears in Collections:
- Department of Chemistry > 1. Journal Articles
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