Magnetotransport study of (Sb 1−x Bi x ) 2 Te 3 thin films on mica substrate for ideal topological insulator

Ni, Yan; Zhang, Zhen; Nlebedim, Cajetan I.; Jiles, David C.

doi:10.1063/1.4943156

Title: Magnetotransport study of (Sb _1−x Bi _x ) ₂ Te ₃ thin films on mica substrate for ideal topological insulator

Journal Article · Sun May 01 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4943156· OSTI ID:1239704

Ni, Yan; Zhang, Zhen; Nlebedim, Cajetan I.; Jiles, David C.

In this study, we deposited high quality (Sb_1–xBi_x)₂Te₃ on mica substrate by molecular beam epitaxy and investigated their magnetotransport properties. It is found that the average surface roughness of thin films is lower than 2 nm. Moreover, a local maxima on the sheet resistance is obtained with x = 0.043, indicating a minimization of bulk conductivity at this composition. For (Sb_0.957Bi_0.043)₂Te₃, weak antilocalization with coefficient of -0.43 is observed, confirming the existence of 2D surface states. Moreover Shubnikov-de Hass oscillation behavior occurs under high magnetic field. The 2D carrier density is then determined as 0.81 × 10¹⁶ m^–2, which is lower than that of most TIs reported previously, indicating that (Sb_0.957Bi_0.043)₂Te₃ is close to ideal TI composition of which the Dirac point and Fermi surface cross within the bulk bandgap. Our results thus demonstrate the best estimated composition for ideal TI is close to (Sb_0.957Bi_0.043)₂Te₃ and will be helpful for designing TI-based devices.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; 1201883

OSTI ID:: 1239704

Alternate ID(s):: OSTI ID: 1240746; OSTI ID: 1421030

Report Number(s):: IS-J-8879

Journal Information:: AIP Advances, Journal Name: AIP Advances Vol. 6 Journal Issue: 5; ISSN 2158-3226

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Magnetotransport study of (Sb _1−x Bi _x ) ₂ Te ₃ thin films on mica substrate for ideal topological insulator