Thermoelectric properties of Mexican-hat band structures

M. Nurhuda, A. R.T. Nugraha, M. Y. Hanna, E. Suprayoga, E. H. Hasdeo

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number015012
JournalAdvances in Natural Sciences: Nanoscience and Nanotechnology
Volume11
Issue number1
DOIs
Publication statusPublished - 2020

Keywords

  • Mexican-hat band
  • substrates
  • thermoelectrics
  • two dimensional materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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    Nurhuda, M., Nugraha, A. R. T., Hanna, M. Y., Suprayoga, E., & Hasdeo, E. H. (2020). Thermoelectric properties of Mexican-hat band structures. Advances in Natural Sciences: Nanoscience and Nanotechnology, 11(1), [015012]. https://doi.org/10.1088/2043-6254/ab7225