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

KW - SB2TE3

KW - CONDUCTION

KW - BI2SE3

KW - BI2TE3

KW - SURFACE-STATE

KW - (BixSb1-x)(2)Te-3

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 -