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Artificial Fine-Tuned van Hove Singularity in Twisted Bilayer and Double-Twist Trilayer Graphene with Enhanced Absorption for Photodetection and Photoemission in the Near-Infrared II Range.
ACS Appl Mater Interfaces
January 2025
State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, Guangzhou 510275, China.
Optical responses of twisted bilayer graphene at targeted wavelengths can be amplified by leveraging energy levels of van Hove singularities (VHS) via tuning periods of moiré superlattices. Therefore, precise control of twist angles as well as the moiré superlattices is necessary for fabricating integrated optoelectronic devices such as photodetectors and emitters. Although recent advances in twist angle control help the observation of correlated states in twisted magic-angle graphene structures, the impact of such precise control on enhanced optical absorption is still under investigation.
View Article and Find Full Text PDF-Resolved Ultrafast Light-Induced Band Renormalization in Monolayer WS on Graphene.
Nano Lett
January 2025
Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
Understanding and controlling the electronic properties of two-dimensional materials are crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides have garnered significant interest due to their strong light-matter interaction and extreme sensitivity of the band structure to the presence of photogenerated electron-hole pairs. In this study, we investigate the transient electronic structure of monolayer WS on a graphene substrate after resonant excitation of the A-exciton using time- and angle-resolved photoemission spectroscopy.
View Article and Find Full Text PDFFeshbach hypothesis of high-Tc superconductivity in cuprates.
Nat Commun
January 2025
Department of Physics and Arnold Sommerfeld Center for Theoretical Physics (ASC), Ludwig-Maximilians-Universität München, München, Germany.
Article Synopsis
- The study explores strong pairing mechanisms in many-body physics, particularly through a Feshbach perspective, focusing on interactions in Fermi-Hubbard models related to doped Mott insulators.
- It theorizes the presence of a low-energy excited state of two holes that facilitates near-resonant interactions, which aligns with observed behaviors in cuprate materials.
- The authors propose experimental methods like cARPES and pair-tunneling measurements to test their theories, suggesting a link between emergent Feshbach resonances and superconductivity in antiferromagnetic Mott insulators.
Probing Photo-Assisted Charge Storage Mechanism Using Bi-Fe Perovskite Oxide Electrode for Solar Supercapacitor.
Small Methods
December 2024
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
In this study, the rhombohedral crystalline pure phase BiFeO (BFO) of irregularly shaped spherical particles of ≈100 nm and energy bandgap of ≈2.31 eV are synthesized by sol-gel auto-combustion method and explored as electrode material for photo-assisted supercapacitor. The electronic structure studies revealed that the coexistence of heterovalent Bi and Fe elements accelerated the electrochemical redox kinetics and photo-assisted charge storage properties.
View Article and Find Full Text PDFRocksalt-type heavy rare earth monoxides TbO, DyO, and ErO exhibiting metallic electronic states and ferromagnetism.
Dalton Trans
January 2025
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Solid-phase rare earth monoxides have been recently synthesized thin film epitaxy. However, it has been difficult to synthesize heavy rare earth monoxides owing to their severe chemical instability. In this study, rocksalt-type heavy rare earth monoxides REOs (RE = Tb, Dy, Er) were synthesized for the first time, as single-phase epitaxial thin films.
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