Reference : Effects of topological band structure on thermoelectric transport of bismuthene
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Effects of topological band structure on thermoelectric transport of bismuthene
Gaffar, Muhammad []
Wella, Sasfan Arman []
Hasdeo, Eddwi Hesky mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Physical Review. B
American Physical Society
Yes (verified by ORBilu)
[en] topology ; thermoelectric ; bismuthene
[en] Two-dimensional bismuth (Bi) layer, known as bismuthene, exhibits Z2 topological bulk states due to large spin-orbit coupling that inverts the bands. Using the tight-binding method, we calculate the band structure of buckled bismuthene to understand its topological and trivial phases. We determine the thermoelectric properties for some considered phases, incorporating the edge states contribution, by using the linearized Boltzmann transport equation with a constant relaxation time approximation. It is shown that the thermoelectric figure of merit, ZT, actually drops in undoped topological bismuthene due to the edge effects. Surprisingly, the topological edge states enhance
ZT at large doping with the Fermi energy near the bottom of bulk bands when bismuthene is nearly metallic.
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