Publications by authors named "Shenkai Wang"
Article Synopsis
- * Synthesis of metallic GNRs has been challenging due to strict structural rules and limited control over the building blocks used in their construction.
- * A new method is reported that creates regular GNRs with strong metallic properties by incorporating a special superlattice structure, which has been confirmed through theoretical models and experimental techniques.
Article Synopsis
- The research focuses on hydrogen-terminated zigzag nanographene and its unique magnetic quantum properties, which are crucial for advancing carbon-based spintronics.
- Zigzag graphene nanoribbons exhibit ferromagnetic edge states that can couple antiferromagnetically across their width, but this magnetic structure has been hard to observe due to interference from the substrate.
- The study introduces a technique to stabilize and isolate these edge states using nitrogen atom dopants, demonstrating significant spin splitting in the electronic structure and paving the way for future applications in nanoscale sensors and logic devices.
Scanning tunneling spectroscopy (STS), a technique that records the change in the tunneling current as a function of the bias (d/d) across the gap between a tip and the sample, is a powerful tool to characterize the electronic structure of single molecules and nanomaterials. While performing STS, the structure and condition of the scanning probe microscopy (SPM) tips are critical for reliably obtaining high quality point spectra. Here, we present an automated program based on machine learning models that can identify the Au(111) Shockley surface state in d/d point spectra and perform tip conditioning on clean or sparsely covered gold surfaces with minimal user intervention.
View Article and Find Full Text PDFWe measured photoinduced charge separation in isolated individual C-tethered 2,5-dithienylpyrrole triad (C triad) molecules with submolecular resolution using a custom-built laser-assisted scanning tunneling microscope. Laser illumination was introduced evanescently into the tunneling junction through total internal reflection, and the changes in tunneling current and electronic spectra caused by photoexcitation were measured and spatially resolved. Photoinduced charge separation was not detected for all C triad molecules, indicating that the conformations of the molecules may affect the excitation probability, lifetime, and/or charge distribution.
View Article and Find Full Text PDF