Searching for new two-dimensional (2D) Dirac cone materials has been popular since the discovery of graphene with a Dirac cone structure. Based on density functional theory (DFT) calculations, we theoretically designed a HfB monolayer as a new 2D Dirac material by introducing the transition metal Hf into a graphene-like boron framework. This newly predicted HfB monolayer has pronounced thermal and kinetic stabilities along with a Dirac cone with a massless Dirac fermion and Fermi velocities (3.59 × 10 and 6.15 × 10 m s) comparable to that of graphene (8.2 × 10 m s). This study enriches the diversity and promotes the application of 2D Dirac cone materials.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9059940 | PMC |
| http://dx.doi.org/10.1039/c8ra08291j | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Generation of Isolated Flat Bands with Tunable Numbers through Moiré Engineering.
Phys Rev Lett
December 2024
Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA and Quantum Materials and Sensing Institute, Northeastern University, Burlington, Massachusetts 01803, USA.
In contrast to the Dirac-cone materials in which the low-energy spectrum features a pseudospin-1/2 structure, Lieb and Dice lattices both host triply degenerate low-energy excitations. Here, we discuss moiré structures involving twisted bilayers of these lattices, which are shown to exhibit a tunable number of isolated flat bands near the Fermi level due to the bipartite nature of their structures. These flat bands remain isolated from the high-energy bands even in the presence of small higher-order terms and chiral-symmetry-breaking interlayer tunneling.
View Article and Find Full Text PDFExploring the electronic and mechanical properties of the recently synthesized nitrogen-doped amorphous monolayer carbon.
Nanoscale
December 2024
University of Brasília, Institute of Physics, Brasília, Federal District, Brazil.
The recent synthesis of nitrogen-doped amorphous monolayer carbon (NAMC) opens new possibilities for multifunctional materials. In this study, we have investigated the nitrogen doping limits and their effects on NAMC's structural and electronic properties using density functional-based tight-binding simulations. Our results show that NAMC remains stable up to 35% nitrogen doping, beyond which the lattice becomes unstable.
View Article and Find Full Text PDFPolarizability, plasmons and damping in pseudospin-1 gapped materials with a flat band.
J Phys Condens Matter
December 2024
Space Vehicles Directorate, US Air Force Research Laboratory, Kirtland Air Force Base, Albuquerque, NM 87117, United States of America.
The subject of our present investigation is the collective electronic properties of various types of pseudospin-1 Dirac-cone materials with a flat band and finite bandgaps in their low-energy spectra. Specifically, we have calculated the dynamical polarization, plasmon dispersions, as well as their decay rates due to Landau damping and presented the closed-form analytical expressions for the wave function overlaps for both the gapped dice lattice and the Lieb lattice. The gapped dice lattice is a special case of the more general-T3model such that its band structure is symmetric and the flat band remains dispersionless.
View Article and Find Full Text PDFPhotonic Dirac waveguide in inhomogeneous spoof surface plasmonic metasurfaces.
Nanophotonics
August 2024
School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
The metamaterial with artificial synthetic gauge field has been proved as an excellent platform to manipulate the transport of the electromagnetic wave. Here we propose an inhomogeneous spoof surface plasmonic metasurface to construct an in-plane pseudo-magnetic field, which is generated by engineering the gradient variation of the opened Dirac cone corresponding to spatially varying mass term. The chiral zeroth-order Landau level is induced by the strong pseudo-magnetic field.
View Article and Find Full Text PDFStructure, Synthetic Pathway, and Properties of Metastable Phosphorus Carbide, PC.
Inorg Chem
November 2024
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 518055 Shenzhen, China.
Due to electronegativity (EN) differences, changing from CN to PC is not as trivial as simply replacing nitrogen by phosphorus in the CN structure. Hence, the nonexistent PC phase is nominally the higher-homologue analogue of the well-known CN, but its structure and properties are practically unknown for fundamental reasons. Here we predict, by means of an extensive structure search, three energetically favorable yet metastable PC phases adopting space groups 1̅, , and , followed by designing their synthetic routes.
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!