Features of display the quantum dimensional effects in cylindrical semimetal bismuth antimony nanowires
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2022-01-31 18:36
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NIKOLAEVA, Albina, KONOPKO, Leonid, GHERGISHAN, Igor, POPOV, Ivan, PARA, Gheorghe, KOBYLIANSKAYA, A.K.. Features of display the quantum dimensional effects in cylindrical semimetal bismuth antimony nanowires. In: NANO-2019: Limits of Nanoscience and Nanotechnologies, Ed. 2019, 24-27 septembrie 2019, Chişinău. Chișinău, Republica Moldova: 2019, p. 94.
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NANO-2019: Limits of Nanoscience and Nanotechnologies 2019
Conferința "SPINTECH Summer school “S/F Hybrid Structures for Spintronics”"
2019, Chişinău, Moldova, 24-27 septembrie 2019

Features of display the quantum dimensional effects in cylindrical semimetal bismuth antimony nanowires


Pag. 94-94

Nikolaeva Albina, Konopko Leonid, Ghergishan Igor, Popov Ivan, Para Gheorghe, Kobylianskaya A.K.
 
Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu"
 
Disponibil în IBN: 27 ianuarie 2020


Rezumat

We have developed the method of preparation of the single- crystalline semimetallic bismuth antimony nano- and microwires in glass cover with diameter from 50 nm to 1000 nm, and orientation along the wire axis [1011], using the Ulitovsky- Taylor method [1]. From Shubnikov- de Haas effect (SdH) have been establish that the overlap L and T bands in Bi0.98Sb0.02 wires is in two time less, then in pure Bi. The “quantum size effect”, which manifests in self when the carrier wave length is comparable with diameter of sample, was observed in Bi0.98Sb0.02 wires at critical diameter of more then fife time greater then on wires pure Bi. The variation of intrinsic properties estimated using SdH oscillations indicates then the subband energy shift due to quantum size effect. At the semimetal- semiconductor transition we observed a new effects- negative magnetoresistance in transverse magnetic field (H^I) and the effect of changing the sign of the thermopower from (-) to (+) with decreasing wires thickness d. It is found that thermoelectric efficiency ZT=a2s/cT can be significant enhanced, if the T point holes are removed or suppressed. The effect of the T- point holes on the thermoelectric figure of merit has been discussed.