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.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.ads2776 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Precise Control Over Crystallization Kinetics by Combining Nucleating Agents and Plasticizers for 20.1% Efficiency Organic Solar Cells.
Adv Mater
March 2025
National Engineering Research Center for Colloidal Materials, Key Laboratory of Special Functional Aggregated Materials (Shandong University), Ministry of Education, School of Chemistry & Chemical Engineering, Shandong University, Jinan, Shandong, 250100, China.
Obtaining controllable active layer morphology plays a significant role in boosting the device performance of organic solar cells (OSCs). Herein, a quaternary strategy, which incorporates polymer donor D18-Cl and small molecule acceptor AITC into the host D18:N3, is employed to precisely modulate crystallization kinetics for favorable morphology evolution within the active layer. In situ spectroscopic measurements during film-formation demonstrate that while D18-Cl works as a nucleator to promote aggregation of D18 and foster donor/acceptor intermixing, AITC has exactly the opposite impact on aggregation of N3 and intermixing kinetics of donor and acceptor, working as a plasticizer.
View Article and Find Full Text PDFUltrafast on-demand exciton formation in a single-molecule junction by tailored terahertz pulses.
Science
March 2025
Surface and Interface Science Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama, Japan.
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.
View Article and Find Full Text PDFPhotoluminescent behavior and structural analysis of SnO layers formed by laser-induced oxidation.
Sci Technol Adv Mater
January 2025
Research Institute of Electronics, Shizuoka University, Hamamatsu, Japan.
We develop a rapid and spatially controlled formation method of a smooth polycrystalline SnO film preventing the transition to a more stable SnO phase. The phase and structural state of a SnO oxide film, which was formed by pulsed irradiation of a Nd:YAG laser on a tin plate in contact with air and distilled water, were studied. XRD, Raman spectra, and kinetics of the exciton PL under femtosecond excitation showed a more perfect textured structure and strong exciton emission of the SnO film obtained by the laser under the conditions of Sn contact with air.
View Article and Find Full Text PDFDesign of Self-Assembled Monolayer in Tungsten Diselenide Bilayer for Exciton Dissociation.
ACS Nano
March 2025
School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea.
Transition metal dichalcogenides (TMDs) have emerged as promising candidates for next-generation self-powered photodetectors due to their distinct optoelectronic properties, including strong light-matter interactions. However, their high exciton binding energies impede efficient exciton dissociation, hindering viable photodetector applications. This study, based on first-principles calculations, introduces a design approach featured by the asymmetrically enclosed structure of the TMD bilayer, i.
View Article and Find Full Text PDFHeteroatom Doping Effects on the Exciton Behavior in Carbonized Polymer Dots.
Nano Lett
March 2025
Key Laboratory of Mesoscopic Chemistry of MOE, State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, China.
Carbonized polymer dots (CPDs) are attractive optoelectronic materials for a variety of applications, but their complex structures hinder a full understanding of their photophysical and excited-state properties. This work illustrates that heteroatom doping (N-doped, N,S-doped, and N,S,F-doped CPDs) significantly affects the exciton behavior of CPDs. It reveals unconventional photoluminescence (PL) blinking with multilevel intensity fluctuations, which depend on the doping type and excitation power density.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!