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Topological Surface States of Dirac Fermions in n-Bi2Te3 –ySey Thermoelectrics

  • XVI INTERNATIONAL CONFERENCE  “THERMOELECTRICS AND THEIR APPLICATIONS–2018” (ISCTA 2018), ST. PETERSBURG, OCTOBER 8–12, 2018
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Abstract

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.

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FUNDING

This study was supported (in part) by the Russian Foundation for Basic Research, project no. 16-08-00478.

ACKNOWLEDGMENTS

We are grateful to A.N. Klimov (Prokhorov General Physics Institute, Moscow) and V.N. Petrov (Ioffe Institute) for continuous assistance and encouragement in refining the spectroscopy programs.

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Authors and Affiliations

  1. Ioffe Institute, 194021, St. Petersburg, Russia

    L. N. Lukyanova, I. V. Makarenko, O. A. Usov & P. A. Dementev

Authors
  1. L. N. Lukyanova
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  2. I. V. Makarenko
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  3. O. A. Usov
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  4. P. A. Dementev
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Correspondence to L. N. Lukyanova.

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Translated by A. Kazantsev

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Lukyanova, L.N., Makarenko, I.V., Usov, O.A. et al. Topological Surface States of Dirac Fermions in n-Bi2Te3 –ySey Thermoelectrics. Semiconductors 53, 647–651 (2019). https://doi.org/10.1134/S1063782619050142

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  • DOI: https://doi.org/10.1134/S1063782619050142

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