Surface states transport in nanowires of topological insulator Bi0.83Sb0.17
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KONOPKO, Leonid; NIKOLAEVA, Albina; HUBER, Tito; ANSERMET, Jean. Surface states transport in nanowires of topological insulator Bi0.83Sb0.17. In: Telecommunications, Electronics and Informatics. 20-23 mai 2015, Chișinău. Chișinău, Republica Moldova: Universitatea Tehnică a Moldovei, 2015, pp. 197-198. ISBN 978-9975-45-377-6.
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Telecommunications, Electronics and Informatics 2015
Conferința "Telecommunications, Electronics and Informatics"
Chișinău, Moldova, 20-23 mai 2015

Surface states transport in nanowires of topological insulator Bi0.83Sb0.17


Pag. 197-198

Konopko Leonid1, Nikolaeva Albina1, Huber Tito2, Ansermet Jean3
 
1 Ghitu Institute of Electronic Engineering and Nanotechnology of the Academy of Sciences of Moldova,
2 Howard University,
3 Universitatea Politehnică Federală din Lausanne
 
Disponibil în IBN: 21 mai 2018


Rezumat

We have investigated the transport properties of topological insulator based on single-crystal Bi0.83Sb0.17 nanowires. The single-crystal nanowire samples in the diameter range 75 nm – 1.1 μm were prepared by the high frequency liquid phase casting in a glass capillary using an improved Ulitovsky technique; they were cylindrical single-crystals with (1011) orientation along the wire axis. The samples resistance increases with decreasing temperature, but at low temperatures decrease in the resistance is observed. This effect is a clear manifestation of the presence on the surface of topological insulators highly conductive zone. The Arrhenius plot of resistance R in samples with diameter d=1.1 μm and d=75 nm indicates a thermal activation behavior with an activation gap ΔE= 21 and 45 meV, respectively, which proves the presence of the quantum size effect in these samples. We found that in the range of diameter 1100 nm - 75 nm when the diameter decreases the energy gap is growing as 1/d. We have investigated magnetoresistance of Bi0.83Sb0.17 nanowires at various magnetic field orientations. From the temperature dependences of Shubnikov de Haas oscillation amplitude for different orientation of magnetic field we have calculated the cyclotron mass mc and Dingle temperature TD. For the first time the Aharonov-Bohm oscillations in Bi0.83Sb0.17 100 nm nanowire were observed.

Cuvinte-cheie
topological insulator, Aharonov-Bohm oscillations,

Bi-Sb nanowires, Shubnikov –de Haas oscillations