Thermoelectric properties of Mexican-hat band structures
| Autor: | Ahmad R. T. Nugraha, Muhammad Nurhuda, E. Suprayoga, Muhammad Y. Hanna, Eddwi H. Hasdeo |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Angular momentum Condensed matter physics Van Hove singularity Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Condensed Matter::Materials Science Singularity Condensed Matter::Superconductivity Thermoelectric effect Density of states Group velocity Condensed Matter::Strongly Correlated Electrons General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Advances in Natural Sciences: Nanoscience and Nanotechnology. 11:015012 |
| ISSN: | 2043-6262 |
| DOI: | 10.1088/2043-6254/ab7225 |
| Popis: | Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its van Hove singularity of density of states in two-dimension. However, within a constant relaxation time approximation, we disprove this belief and we find that the singularity effect is cancelled down by the group velocity contribution in the thermoelectric transport distribution. Nevertheless, the band parameters can still be optimised to reach thermoelectric figure of merit larger than 2 in a wide bandwidth, thus keeping the potential of materials with Mexican-hat bands for thermoelectric applications. |
| Databáze: | OpenAIRE |
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