Three-dimensional graphdiyne as a topological nodal-line semimetal
| Autor: | Mikito Koshino, Ryota Sakamoto, Tetsuro Habe, Takafumi Nomura |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Winding number FOS: Physical sciences Torus Fermi surface Position and momentum space 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Semimetal symbols.namesake Planar Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences symbols General Materials Science 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) Electronic band structure |
| Zdroj: | Physical Review Materials. 2 |
| ISSN: | 2475-9953 |
| DOI: | 10.1103/physrevmaterials.2.054204 |
| Popis: | We study the electronic band structure of three-dimensional ABC-stacked (rhombohedral) graphdiyne, which is a new planar carbon allotrope recently fabricated. Using the first-principles calculation, we show that the system is a nodal-line semimetal, in which the conduction band and valence band cross at a closed ring in the momentum space. We derive the minimum tight-binding model and the low-energy effective Hamiltonian in a $4\times 4$ matrix form. The nodal line is protected by a non-trivial winding number, and it ensures the existence of the topological surface state in a finite-thickness slab. The Fermi surface of the doped system exhibits a peculiar, self-intersecting hourglass structure, which is quite different from the torus or pipe shape in the previously proposed nodal semimetals. Despite its simple configuration, three-dimensional graphdiyne offers unique electronic properties distinct from any other carbon allotropes. Comment: 6 pages, 5 figures |
| Databáze: | OpenAIRE |
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