Topological Surface States of Multicomponent Thermoelectrics Based on Bismuth Telluride
- Авторлар: Lukyanova L.1, Makarenko I.1, Usov O.1, Dementev P.1
-
Мекемелер:
- Ioffe Institute
- Шығарылым: Том 53, № 13 (2019)
- Беттер: 1860-1865
- Бөлім: Thermoelectrics and Their Applications
- URL: https://journals.rcsi.science/1063-7826/article/view/207490
- DOI: https://doi.org/10.1134/S1063782619130128
- ID: 207490
Дәйексөз келтіру
Аннотация
The surface states of Dirac fermions in p-Bi2Te3, p-Bi2 –xSbxTe3 –ySey, and p-Bi2 –x–ySnxGeyTe3 thermoelectrics were studied and its topological characteristics were obtained by scanning tunneling techniques in dependence on compositions. It was shown that the thermoelectric power factor and the material parameter enhance with the shift of the Dirac point to the top of the valence band with the increasing of atomic substitution in these thermoelectrics. A growth contribution of the surface states is determined by an increase of the Fermi velocity for large atomic substitutions of Bi at x > 1.5 and small substitutions in the Te sublattice (y = 0.06). In compositions with smaller substitutions at x = 1–1.3 and y = 0.06–0.09, similar effect of the surface states is determined due to raising the surface concentration of charge carriers.
Авторлар туралы
L. Lukyanova
Ioffe Institute
Хат алмасуға жауапты Автор.
Email: lidia.lukyanova@mail.ioffe.ru
Ресей, St. Petersburg, 194021
I. Makarenko
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Ресей, St. Petersburg, 194021
O. Usov
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Ресей, St. Petersburg, 194021
P. Dementev
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Ресей, St. Petersburg, 194021