Evolution of the charge density wave order on the two-dimensional hexagonal lattice
| Autor: | Karol Wysokiński, Karol Izydor Wysokinski, Grzegorz Litak |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Transition temperature Fermi energy Fermi surface 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Instability Electronic Optical and Magnetic Materials Lattice (order) 0103 physical sciences Density of states Condensed Matter::Strongly Correlated Electrons Hexagonal lattice 010306 general physics 0210 nano-technology Charge density wave |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 440:104-107 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2016.12.042 |
| Popis: | Experimental data on the monolayer niobium diselenide show that the single band crosses the Fermi energy. This is in striking contrast to the bulk systems in which at least three bands contribute to the Fermi surface of the material. Together with the fact that the charge density wave (CDW) transition temperature T c of a bulk system and of a single layer are the same one concludes that it should allow description of the two dimensional system by a single band in the tight-binding approximation. We analyse the development of CDW order of triangular symmetry in two-dimensional lattice of hexagonal symmetry. We assume the existence of four sublattices and calculate the resulting density of states and the formation of CDW gap for systems with varying carrier concentration. The mechanism of CDW instability, most probably related to the strong electron-phonon coupling in the material, is modeled by the local attractive interaction U of the same strength on all sites. |
| Databáze: | OpenAIRE |
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