Topological Surface States of Dirac Fermions in n-Bi₂Te_3-ySe_y Thermoelectrics

Journal Article · Wed May 15 00:00:00 EDT 2019 · Semiconductors

DOI:https://doi.org/10.1134/S1063782619050142· OSTI ID:22945014

Makarenko, I. V.; Usov, O. A.; Dementev, P. A. ^[1]

---

1. Ioffe Institute (Russian Federation)

In n-Bi{sub 2}Te{sub 3} and n-Bi₂Te_3-ySe_y 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 E_D 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-Bi₂Te_3-ySe_y 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.

• OSTI ID: 22945014
• Journal Information: Semiconductors, Vol. 53, Issue 5; Other Information: Copyright (c) 2019 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH SELENIDES
BISMUTH TELLURIDES
CONCENTRATION RATIO
FERMI LEVEL
FERMIONS
MORPHOLOGY
SCANNING TUNNELING MICROSCOPY
SEEBECK EFFECT
SPECTROSCOPY
SURFACES
THERMOELECTRIC PROPERTIES
TOPOLOGY
TUNNEL EFFECT
VALENCE
VAN DER WAALS FORCES