### Abstract

We show Shubnikov-de Haas (SdH) oscillations in topological insulator (Bi_{x}Sb_{1-x})_{2}Te_{3} flakes whose carrier types are p-type (x = 0.29, 0.34) and n-type (x = 0.42). The physical properties such as the Berry phase, carrier mobility, and scattering time significantly changed by tuning the Fermi-level position with the concentration x. The analyses of SdH oscillations by Landau-level fan diagram, Lifshitz-Kosevich theory, and Dingle-plot in the p-type samples with x = 0.29 and 0.34 showed the Berry phase of zero and a relatively low mobility (2000-6000 cm^{2} V^{-1} s^{-1}). This is due to the dominant bulk component in transport. On the other hand, the mobility in the n-type sample with x = 0.42 reached a very large value ∼17 000 cm^{2} V^{-1} s^{-1} and the Berry phase of near π, whereas the SdH oscillations were neither purely two- nor three-dimensional. These suggest that the transport channel has a surface-bulk coupling state which makes the carrier scattering lesser and enhances the mobility and has a character between two- and three-dimension.

Original language | English |
---|---|

Article number | 265001 |

Journal | Journal of Physics Condensed Matter |

Volume | 30 |

Issue number | 26 |

DOIs | |

Publication status | Published - 6 Jun 2018 |

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### Scopus subject areas

- Materials Science(all)
- Condensed Matter Physics

### Cite this

_{x}Sb

_{1-x})

_{2}Te

_{3}.

*Journal of Physics Condensed Matter*,

*30*(26), [265001]. https://doi.org/10.1088/1361-648X/aac59b

}

_{x}Sb

_{1-x})

_{2}Te

_{3}',

*Journal of Physics Condensed Matter*, vol. 30, no. 26, 265001. https://doi.org/10.1088/1361-648X/aac59b

**Shubnikov-de Haas oscillations in p and n-type topological insulator (Bi _{x}Sb_{1-x})_{2}Te_{3}.** / Akiyama, Ryota; Sumida, Kazuki; Ichinokura, Satoru; Nakanishi, Ryosuke; Kimura, Akio; Kokh, Konstantin A.; Tereshchenko, Oleg E.; Hasegawa, Shuji.

Research output

TY - JOUR

T1 - Shubnikov-de Haas oscillations in p and n-type topological insulator (BixSb1-x)2Te3

AU - Akiyama, Ryota

AU - Sumida, Kazuki

AU - Ichinokura, Satoru

AU - Nakanishi, Ryosuke

AU - Kimura, Akio

AU - Kokh, Konstantin A.

AU - Tereshchenko, Oleg E.

AU - Hasegawa, Shuji

PY - 2018/6/6

Y1 - 2018/6/6

N2 - We show Shubnikov-de Haas (SdH) oscillations in topological insulator (BixSb1-x)2Te3 flakes whose carrier types are p-type (x = 0.29, 0.34) and n-type (x = 0.42). The physical properties such as the Berry phase, carrier mobility, and scattering time significantly changed by tuning the Fermi-level position with the concentration x. The analyses of SdH oscillations by Landau-level fan diagram, Lifshitz-Kosevich theory, and Dingle-plot in the p-type samples with x = 0.29 and 0.34 showed the Berry phase of zero and a relatively low mobility (2000-6000 cm2 V-1 s-1). This is due to the dominant bulk component in transport. On the other hand, the mobility in the n-type sample with x = 0.42 reached a very large value ∼17 000 cm2 V-1 s-1 and the Berry phase of near π, whereas the SdH oscillations were neither purely two- nor three-dimensional. These suggest that the transport channel has a surface-bulk coupling state which makes the carrier scattering lesser and enhances the mobility and has a character between two- and three-dimension.

AB - We show Shubnikov-de Haas (SdH) oscillations in topological insulator (BixSb1-x)2Te3 flakes whose carrier types are p-type (x = 0.29, 0.34) and n-type (x = 0.42). The physical properties such as the Berry phase, carrier mobility, and scattering time significantly changed by tuning the Fermi-level position with the concentration x. The analyses of SdH oscillations by Landau-level fan diagram, Lifshitz-Kosevich theory, and Dingle-plot in the p-type samples with x = 0.29 and 0.34 showed the Berry phase of zero and a relatively low mobility (2000-6000 cm2 V-1 s-1). This is due to the dominant bulk component in transport. On the other hand, the mobility in the n-type sample with x = 0.42 reached a very large value ∼17 000 cm2 V-1 s-1 and the Berry phase of near π, whereas the SdH oscillations were neither purely two- nor three-dimensional. These suggest that the transport channel has a surface-bulk coupling state which makes the carrier scattering lesser and enhances the mobility and has a character between two- and three-dimension.

KW - (BiSb)Te

KW - Berry phase

KW - electrical transport

KW - quantum oscillation

KW - Shubnikov-de Haas oscillation

KW - topological insulator

UR - http://www.scopus.com/inward/record.url?scp=85049032658&partnerID=8YFLogxK

U2 - 10.1088/1361-648X/aac59b

DO - 10.1088/1361-648X/aac59b

M3 - Article

AN - SCOPUS:85049032658

VL - 30

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 26

M1 - 265001

ER -

_{x}Sb

_{1-x})

_{2}Te

_{3}. Journal of Physics Condensed Matter. 2018 Jun 6;30(26). 265001. https://doi.org/10.1088/1361-648X/aac59b