Resolving the Dirac cone on the surface of Bi2Te3 topological insulator nanowires by field-effect measurements

Resolving the Dirac cone on the surface of Bi2Te3 topological insulator nanowires by field-effect measurements

We validate the linear dispersion relation (Dirac cone) on the surface of a single Bi2Te3 nanowire via a combination of field-effect and magnetoresistance measurements by which we unambiguously prove the topological insulator nature of the nanowire surface states. Moreover, we show that the experime...

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Bibliographic Details
Published in:Applied physics letters Vol. 104; no. 24
Main Authors: Gooth, Johannes, Hamdou, Bacel, Dorn, August, Zierold, Robert, Nielsch, Kornelius
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 16-06-2014
Subjects:
Applied physics
Bismuth tellurides
Carrier density
Cyclotrons
Magnetoresistance
Magnetoresistivity
Nanowires
Photoelectric emission
Topological insulators
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Summary:We validate the linear dispersion relation (Dirac cone) on the surface of a single Bi2Te3 nanowire via a combination of field-effect and magnetoresistance measurements by which we unambiguously prove the topological insulator nature of the nanowire surface states. Moreover, we show that the experimentally determined carrier concentration, mobility, and cyclotron mass of the surface states are in excellent agreement with relativistic models. Our method provides a facile way to identify topological insulators that too small for angle-resolved photoemission spectroscopy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4883887