Using angle resolved photoemission spectroscopy, we report the first band dispersions and distinct features of the bulk Fermi surface (FS) in the paramagnetic metallic phase of the prototypical metal-insulator transition material V_{2}O_{3}. Along the c axis we observe both an electron pocket and a triangular holelike FS topology, showing that both V 3d a_{1g} and e_{g}^{π} states contribute to the FS. These results challenge the existing correlation-enhanced crystal field splitting theoretical explanation for the transition mechanism and pave the way for the solution of this mystery.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.117.166401 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Topological Bardeen-Cooper-Schrieffer theory of superconducting quantum rings.
Eur Phys J B
January 2025
Department of Physics "A. Pontremoli", University of Milan, Via Celoria 16, 20133 Milan, Italy.
Abstract: Quantum rings have emerged as a playground for quantum mechanics and topological physics, with promising technological applications. Experimentally realizable quantum rings, albeit at the scale of a few nanometers, are 3D nanostructures. Surprisingly, no theories exist for the topology of the Fermi sea of quantum rings, and a microscopic theory of superconductivity in nanorings is also missing.
View Article and Find Full Text PDFImpact of Pressure on Metavalent Bonding in BiTe influencing Electronic Topological Transitions.
Angew Chem Int Ed Engl
January 2025
JNCASR: Jawaharlal Nehru Centre for Advanced Scientific Research, New Chemistry Unit, Jakkur, Bangalore, INDIA.
BiTe, a member of the (Bi2)m(Bi2Te3)n homologous series, possesses natural van der Waals-like heterostructure with a Bi2 bilayer sandwiched between the two [Te-Bi-Te-Bi-Te] quintuple layers. BiTe exhibits both the quantum states of weak topological and topological crystalline insulators, making it a dual topological insulator and a suitable candidate for spintronics, quantum computing and thermoelectrics. Herein, we demonstrate that the chemical bonding in BiTe is to be metavalent, which plays a significant role in the pressure dependent change in the topology of the electronic structure Fermi surface.
View Article and Find Full Text PDFRapid and in-depth reconstruction of fluorine-doped bimetallic oxide in electrocatalytic oxygen evolution processes.
J Colloid Interface Sci
January 2025
Key Laboratory of Fine Chemicals of College of Heilongjiang Province, Qiqihar University, Qiqihar 161006, China; School of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China. Electronic address:
Most transition metal-based electrocatalysts, when used for the oxygen evolution reaction (OER), undergo significant restructuring under alkaline conditions, forming localized oxides/hydroxides (MOOH), which act as the real active centers, activating adjacent metal sites and creating new active sites that enhance electrocatalytic behavior. Nevertheless, inducing rapid and in-depth self-reconstruction of catalyst surfaces remains a huge challenge. Herein, this work achieves rapid and in-depth self-reconstruction by doping fluorine into the lattice of transition metal oxides (MO).
View Article and Find Full Text PDFCO Adsorption on a Single-Atom Catalyst Stably Embedded in Graphene.
Angew Chem Int Ed Engl
January 2025
Università di Milano-Bicocca, Dipartimento di Scienza dei Materiali, via Cozzi 55, 20125, Milano, ITALY.
Confined single metal atoms in graphene-based materials have proven to be excellent catalysts for several reactions and promising gas sensing systems. However, whether the chemical activity arises from the specific type of metal atom or is a direct consequence of the confinement itself remains unclear. In this work, through a combined density functional theory and experimental surface science study, we address this question by investigating Co and Ni single atoms embedded in graphene (Gr) on a Ni(111) support.
View Article and Find Full Text PDFActivated Graphite with Richly Oxygenated Surface from Spent Lithium-Ion Batteries for Microwave Absorption.
Small
January 2025
School of Materials and Physics & Center of Mineral Resource Waste Recycling, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
Designing spent graphite anodes from lithium-ion batteries (LIBs) for applications beyond regenerated batteries offers significant potential for promoting the recycling of spent LIBs. The battery-grade graphite, characterized by a highly graphitized structure, demonstrates excellent conductive loss capabilities, making it suitable for microwave absorption. During the Li-ion intercalation and deintercalation processes in battery operation, the surface layer of spent graphite (SG) becomes activated, forming oxygen-rich functional groups that enhance the polarization loss mechanism.
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!