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Optical conductivity of triple point fermions

Habibi, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1088/1361-648X/abd739
  3. Publisher: IOP Publishing Ltd , 2021
  4. Abstract:
  5. As a low-energy effective theory on non-symmorphic lattices, we consider a generic triple point fermion Hamiltonian, which is parameterized by an angular parameter λ. We find strong λ dependence in both Drude and interband optical absorption of these systems. The deviation of the T2 coefficient of the Drude weight from Dirac/Weyl fermions can be used as a quick way to optically distinguish the triple point degeneracies from the Dirac/Weyl degeneracies. At the particular λ = π/6 point, we find that the 'helicity' reversal optical transition matrix element is identically zero. Nevertheless, deviating from this point, the helicity reversal emerges as an absorption channel. © 2021 IOP Publishing Ltd
  6. Keywords:
  7. Lattice theory ; Optical conductivity ; Drude weights ; Effective theories ; Helicities ; Interband optical absorption ; Parameterized ; Transition matrix elements ; Triple points ; Light absorption
  8. Source: Journal of Physics Condensed Matter ; Volume 33, Issue 12 , 2021 ; 09538984 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/1361-648X/abd739/meta