Article (Scientific journals)
Optical conductivity of triple point fermions
Habibi, Alireza; Farajollahpour, Tohid; Jafari, S A
2021In Journal of Physics: Condensed Matter, 33, p. 125701
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Keywords :
: triple point fermion, topological insulator, three-fold degeneracy, optical conductivity; Chern number; flat band
Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Habibi, Alireza ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Farajollahpour, Tohid
Jafari, S A
External co-authors :
yes
Language :
English
Title :
Optical conductivity of triple point fermions
Publication date :
12 January 2021
Journal title :
Journal of Physics: Condensed Matter
ISSN :
1361-648X
Publisher :
Institute of Physics Publishing, Bristol, United Kingdom
Volume :
33
Pages :
125701
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR7556175 - Modern Mesoscopic Systems And Applications In Nanoelectronics And Spintronics, 2014 (01/02/2015-31/07/2021) - Thomas Schmidt
Name of the research project :
ATTRACT 7556175
Funders :
e National Research Fund Luxembourg
Available on ORBilu :
since 18 January 2021

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