Topological Surface States of Dirac Fermions in n-Bi2Te3 –ySey Thermoelectrics
- Авторы: Lukyanova L.1, Makarenko I.1, Usov O.1, Dementev P.1
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Учреждения:
- Ioffe Institute
- Выпуск: Том 53, № 5 (2019)
- Страницы: 647-651
- Раздел: XVI International Conference “thermoelectrics and Their Applications–2018” (Iscta 2018,) St. Petersburg, October 8–12, 2018
- URL: https://journals.rcsi.science/1063-7826/article/view/206097
- DOI: https://doi.org/10.1134/S1063782619050142
- ID: 206097
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Аннотация
In n-Bi2Te3 and n-Bi2Te3 –ySey thermoelectrics, the surface states of Dirac fermions of the interlayer Van der Waals surface (0001) are studied by scanning tunneling microscopy and spectroscopy. The surface morphology and modulated line profiles of the tunneling microscopy images are determined by local distortions of the surface density of electronic states and depend on the composition. The Dirac point ED in the studied compositions is localized in the band gap and shifts to the top of the valence band with increasing Se content in n-Bi2Te3 –ySey alloys. The dependence between the parameters of the surface states of Dirac fermions (Dirac-point position, Fermi velocity, surface fermion concentration) and thermoelectric properties (Seebeck coefficient and power parameter) in the thermoelectrics under study is determined.
Об авторах
L. Lukyanova
Ioffe Institute
Автор, ответственный за переписку.
Email: lidia.lukyanova@mail.ioffe.ru
Россия, St. Petersburg, 194021
I. Makarenko
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Россия, St. Petersburg, 194021
O. Usov
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Россия, St. Petersburg, 194021
P. Dementev
Ioffe Institute
Email: lidia.lukyanova@mail.ioffe.ru
Россия, St. Petersburg, 194021