Reference : Optical conductivity of triple point fermions
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Optical conductivity of triple point fermions
Habibi, Alireza mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Farajollahpour, Tohid []
Jafari, S A []
Journal of Physics: Condensed Matter
Institute of Physics Publishing
Yes (verified by ORBilu)
United Kingdom
[en] : triple point fermion, topological insulator, three-fold degeneracy, optical conductivity ; Chern number ; flat band
[en] 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.
e National Research Fund Luxembourg
ATTRACT 7556175
FnR ; FNR7556175 > Thomas Schmidt > MoMeSys > Modern mesoscopic systems and applications in nanoelectronics and spintronics > 01/02/2015 > 31/01/2020 > 2014

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